Here are some differences between Roomba 880 and 595.
Roomba 595 vs 880
images from manufacturer

Carrying Handle
This is one of the apparent differences you can find from the appearance, the 880 has a flip-up carrying handle for easy one-handed transport whereas the 595 has no carrying handle.

Cleaning System
There is big change in the cleaning system.
The 595 uses counter rotating Bristle Brush and Rubber Brush to pick up dirt, dust, debris and pet hair from the floor.
Whereas the 880 uses Dual Brushless Extractors to grab and break down dirt and debris from the floor.
What’s the benefit of the new brushless extractors? Less hair tangle and less maintenance compared to the brush design.
The 880 also features a High Efficiency Vacuum and Airflow Accelerator.
iRobot claim that the new cleaning system provides greater air power and picks up more debris

Filtration
The 880 uses a HEPA filter to capture more tiny particles whereas the 595 uses standard AeroVac filter.
The filters are not interchangeable.

Dirt Detect Technology
The dirt detect system is different on these 2 models.
The 595 uses only acoustic sensor to sense dirt whereas the 880 adds the optical sensors to the dirt detect system, thus it has both optical and acoustic sensors to find dirt and debris.

Persistent Pass Cleaning Method
The 880 employs the Persistent Pass Cleaning Method that uses a back-and-forth cleaning pattern to vacuum spots where it senses more dirt.
While the 595 does not feature the Persistent Pass Cleaning.

Lighthouse Compatibility
The 595 is not compatible with lighthouse while the 880 supports Lighthouse.
What the Lighthouses do is to help Roomba navigate room to room.
Can the Roomba clean more than one room without the Lighthouses? Yes. But the cleaning will not be efficient, and the Roomba may miss some spots.

Full Bin Indicator
The 595 has no full bin indicator while the 880 has a full bin light to tell you when to empty it.

Battery
There is an upgrade on they battery.
The 595 uses the Advanced Power Battery whereas the 880 uses the battery which is called XLife Extended Life Battery.
What’s the difference? iRobot claim that the new battery can doubles the time before you may need to replace the battery.

Home Base
The 595 comes with a Self-Charging Home Base with Power Supply whereas the 880 comes with an Integrated Home Base for auto docking and charging.

Retail Price
The 595 retail price is much lower than the 880.
The 595 was sold at $299.99 at Costco, it has been discontinued.
Whereas the 880 is priced at $699.99 on irobot.com.

Included Accessories
The 880 comes with 2 Virtual Wall Lighthouses with C batteries included whereas the 595 comes with 2 Auto Virtual Walls with C batteries included.
The 880 comes with 1 Extra Filter whereas the 595 come with 3 Extra Filters.
The 880 comes with a Remote Control that the 595 does not include.
The 595 comes with 2 Brush Cleaning Tools that the 880 does not come with.
The 595 also comes with 2 Extra Side Brushes, 2 Extra Rubber Brushes, and 2 Extra Bristle Brushes while the 880 has no extra side brushes nor extra extractors.

If you know more difference between Roomba 595 and 880, please share below.

You will find that there are some distinct differences between Roomba 880 and 630 when comparing them.
Roomba 630 vs 880
images from manufacturer

Cleaning System
The cleaning system changes a lot.
The 880 now employs 2 Brushless Extractors versus 1 Bristle Brush + 1 Rubber Brush on the 630.
Brushless Design = less hair tangle, less maintenance
The 880 cleaning system also employs New Vacuum and Airflow Accelerator to delivers better suction to pick up more.

Filter
The 880 uses HEPA filter whereas the 630 uses standard filter.

Dirt Detect Technology
The 880 uses Dirt Detect Series 2 that employs both acoustic and optical sensors to find dirt whereas the 630 uses Dirt Detect Series 1 that employs only acoustic sensor to find dirt.

Room to Room Navigation
The 880 is compatible Lighthouse that helps room to room navigator whereas the 630 is not compatible with lighthouse.

Scheduling Feature
The 880 has on-board scheduling that you can use to schedule the unit to vacuum max 7 times a week whereas the 630 does NOT have the scheduling feature.

Full Bin Indicator
The 880 has a light to tell you when it is full whereas the 630 has no full bin indicator.

Persistent Pass Cleaning Method
The 880 employs a back-and-forth cleaning pattern to clean areas where it finds excessive dirt whereas the 630 does not have this Persistent Pass feature.

Battery
The 880 includes the Xlife Extended Life Battery to replace the APS battery on the 630, iRobot claim that the Xlife will doubles the time before you may need to replace the battery.

Home Base
The 880 comes with the new Integrated Home Base whereas the 630 comes with a Self-Charging Home Base and a Battery Charger.

Dimensions and Weight
The 630 measures 13.39 inches in diameter, 3.62 inches in height, weighs 7.9 pounds. The 880 measures 13.9 inches in diameter, 3.6 inches in height, weighs 8.4 pounds.
You can see that the 880 has a larger diameter and heavier weight.

Retail Price
The 880 retail price is much higher than the 630.
On irobot.com, the 880 is priced at $699.99 versus $349.99 on the 630.

Included Accessories
The 880 comes with 2 Virtual Wall Lighthouses with C batteries included whereas the 630 comes with 1 Auto Virtual Wall without C batteries.
The 880 comes with a Remote Control that lets you turn it on/off, steer it around, and remote access to Roomba commands, while the 630 does not come with this kit.
The 630 comes with 1 flat brush cleaning tool whereas the 880 does not include.
Both of them come with 1 Extra Filter.

Noise Level
The 880 noise level is slightly lower, but the difference is not significant.

If you know more difference between Roomba 630 and 880, please share your reviews below.

There are a few differences between Roomba 880 and 760, let’s compare these 2 Robotic vacuum cleaners below.
Roomba 760 vs 880
images from manufacturer

Cleaning System
The 880 changes a lot on the cleaning system, it uses 2 rubber Brushless Extractors to replace the Rubber Brush and Bristle Brush on the 760. With the extractors, there will be less hair tangle problems, so less maintenance.
There are also a new vacuum that generate more suction power and new Airflow Accelerator to help pick up more dirt.

Filter
Both of the 880 and 760 use HEPA filters, however, the 880 uses one large filter whereas the 760 uses dual small filters.

Lighthouse
The 880 is compatible with the Lighthouse which can navigate the Roomba to clean from room to room whereas the 760 does not support the Lighthouse.

Home Base
The 880 uses an Integrated Home Base for docking and recharging whereas the 760 comes with a Self-Charging Home Base and a Battery Charger.

Battery
The 880 uses the XLife Extended Life battery that has longer lifespan than the Advanced Power System battery that is used on the 760.
The Xlife battery costs $79.99 that is $10 more expensive than the APS battery, and the XLife battery can be used on the 760.

Full Bin Indicator
The 880 features a full bin indicator whereas the 760 has no light to indicate when it is full.

Dirt Detect
The 880 uses Dirt Detect Series 2 to find dirt whereas the 760 uses Dirt Detect Series 1.
The difference between series 2 and 1 is that the series 2 adds the optical sensors while the series 1 uses only acoustic sensors.

Noise Level
The 880 is quieter than the 760 according to user feedbacks.

Price
The 880 is more expensive than the 760.
The 880 is priced at $699.99 versus $449.99 for the 760 at irobot.com.

Included Accessories
The 880 includes 2 Virtual Wall Lighthouses (batteries included) while the 760 comes with 2 Auto Virtual Walls (C batteries not included).
The 880 comes with 1 Extra Filter while the 760 comes with 1 Extra Set of Filters (2 filters).
The 760 comes with 2 brush cleaning tools while the 880 has no brush cleaning tools, however, the 880 does not need these tools since it has no bristle brush.
Both of them come with a remote control.

Color
The 880 is in darker color.

Know more difference between the iRobot Roomba 760 and 880? If yes, please share below.

The major difference between Roomba 650 and 595 are the carrying handle and included accessories.
Roomba 595 vs 650
images from manufacturer

Carrying Handle
On the faceplate, you can find that the 650 adds a recessed carrying handle while the 595 does not have.

Accessories
The 595 comes with more accessories.
The 595 comes with 2 Virtual Walls with 4 Duracell C batteries while the 650 comes with 1 Virtual Wall without C batteries.
The 595 comes with 4 AeroVac filters whereas the 650 comes with 1 AeroVac filter.
The 595 comes with 3 Side Brushes, 3 Rubber Brushes, 3 Bristle Brushes while the 650 comes with 1 Side Brush, 1 Rubber Brush, 1 Bristle Brush.
The 595 comes with 1 Round and 1 Flat brush cleaning tools while the 650 comes with 1 Flat brush cleaning tool.

Price
The 595 has been discontinued, it was sold at $299.99 at Costco and the official site did not sell this model while the 650 costs $399.99 at irobot.com.

If you know more difference between the Roomba 595 and 650, please share below.

The difference between Roomba 760 and 650 are as follows.
Hightlights: Cleaning System, Filtration, Accessories
Roomba 760 vs 650
images from manufacturer

Cleaning System
They both use the iRobot patented 3-stage cleaning process to vacuum, however, there is still difference on the cleaning system, they 650 employs AeroVac version 1 while the 760 employs version 2.
As part of the version 2, the 760 uses a redesign cleaning head that is claimed to provide better performance for picking up pet hair, dirt, allergens, etc. They said the cleaner head is designed particularly for pets.

Filtration
There is big change on the filtration.
Unlike the 650 which uses a standard filter – AeroVac Filter, the 760 uses Dual HEPA Filters inside the bin. The HEPA filters do better at filtering fine particles as tiny as 0.3 microns, thus improve the indoor air quality.

Bin
The 650 uses AeroVac Series 1 Bin whereas the 760 uses AeroVac Series 2 Bin. Not much difference on the capacity.

Price
There’s a $50 price difference.
The Roomba 650 costs $399.99 whereas the 760 is priced at $449.99 at store.irobot.com.

Extended-Life Power Management
The 760 features the Extended-Life Power Management software which is claimed to deliver up to 50% longer battery life.

Remote Control
The 760 comes with a Remote Control to let you control the Roomba with no need to touch it while the 650 has no remote control.
However, this kit is not that practical, there are a lot of users do not use it even they have it.

Accessories
The 650 comes with 1 auto Virtual Wall, 1 flat brush cleaning tool, 1 extra AeroVac filter.
The 760 comes with 2 Auto Virtual Walls, 1 flat brush cleaning tool and 1 round brush cleaning tool, 1 Extra Set of HEPA Filters.

Dimensions and Weight
The 650 weighs 7.9 lbs versus 8.4 lbs on the 760.
The 650 measures 13.39 inches in diameter versus 13.9 inches on the 760.

Color
The 760 is in lighter color.