The iRobot Roomba 880 is the latest model of the Roomba vacuum cleaning robot, it has so many new redesign compared to previous Roomba 600 models.
Below are some difference between Roomba 880 and 655.
Roomba 880 vs 655
images from manufacturer

Price
Well, the cost may be something that many people will take into consideration. The Roomba 880 costs twice as much as the 655, its retail price is $699.99 whereas the Roomba 655 is sold at $349.99 on costco.com

Cleaning System
The cleaning systems on these 2 models are very different.
The 880 features the AeroForce Performance Cleaning System while the 655 uses AeroVac Series I cleaning system.
One of the biggest difference is the rotating beater design. The 880 uses Dual Brushless counter-rotating AeroForce Extractors to break down debris and lift dirt whereas the 655 uses 1 Bristle Brush and 1 Rubber Brush.
According to iRobot, the 880 extractor design can eliminate tangled hair, thus it requires less maintenance, and the new cleaning system has better suction power.

Room to Room Cleaning
The Roomba 880 is compatible with Virtual Wall Lighthouse which guides Roomba to clean from room to room efficiently whereas the 655 does not support the Lighthouse.

Filtration
The Roomba 880 employs a HEPA filter to keep your air clean while the 655 uses AeroVac Filter.

Dirt Detect
The Roomba 880 features Dirt Detect Series 2 whereas the 655 uses Dirt Detect Series 1.
The major difference between Dirt Detect Series 2 and 1 is that the Series 2 uses both acoustic and optical sensors to find dirt and perform concentrated cleaning whereas the Series 1 employs only acoustic sensors.

Persistent Pass Cleaning
The Roomba 880 features Persistent Pass Cleaning which the 655 does not have.
The Persistent Pass Cleaning uses a back-and-forth cleaning pattern to spend more time cleaning the spots that has more dirt.

Remote Control
The 880 includes a remote control that allows you to control the Roomba’s functions conveniently.
Whereas the 655 does not has the remote control.

Full Bin Indicator
The 880 features Full Bin Indicator whereas the 655 does not have this function.

Size
The 880 is larger, its diameter is 13.9 inches whereas the 655 has a 13.39 diameter.

Weight
The 880 weighs 8.4 pounds versus 7.9 pounds on the 655.

Virtual Wall / Virtual Wall Lighthouse
The 880 comes with 2 Virtual Wall Lighthouses while the 655 comes with 1 Virtual Wall.

Appearance
As you can see from the product images, these 2 robotic vacuum cleaners have different faceplate design, the 880 looks cooler.

Noise Level
According to user reviews, the 880 is quieter than the 655.

If you know other difference between iRobot Roomba 655 and 880, please share below to help others buy the right robot.

There are a few difference between Roomba 770 and 655, such as the brushes, full bin indicator and filters. Let’s discuss the differences below.
Roomba 770 vs 655
images from manufacturer

Price
The 770 is $150 more expensive than the 655.
The 770 is priced at $499.99 at irobot.com whereas the 655 is priced at $349.99 at costco.com

Dirt Detect Technology
The 655 uses the Dirt Detect Technology Series 1 whereas the 770 uses the Dirt Detect Technology Series 2.
The difference between these 2 Dirt Detect series is that the Series 1 employs only Acoustic sensor to identify dirtier areas and spends more time cleaning there whereas the Series 2 uses both Acoustic and Optical Sensors to get the job done.

Filter Type
The 655 uses AeroVac Filiter whereas the 770 uses Dual HEPA air filters to make the air cleaner.

Full Bin Indicator
The 770 has a Full Bin Indicator to tell you when the bin needs to be emptied whereas the 655 has no such indicator.

Persistent Pass Cleaning Method
The 770 features a Persistent Pass Cleaning Method that uses a back and forth cleaning pattern to apply elbow grease in areas with excessive dirt

Remote Control
The 770 comes with an Infrared Remote Control that lets you to control the robot without touching it wheres the 655 has no remote control.

Bin Type
The 655 uses the AeroVac Series 1 Bin whereas the 770 uses AeroVac Series 2 Bin.
According to user reviews, the AeroVac Series 1 Bin holds more dirt and is easier to clean than the Series 2.

Battery
The 770 uses Advanced Power System Battery while the 655 uses Xlife Extended Life Battery.

Dimensions
The 770 is larger.
Dimensions of 770: 13.9″ in diameter, 3.6″ in height
Dimensions of 655: 13.39″ in diameter, 3.62″ in height.

Virtual Wall
The 770 comes with 2 Virtual Walls whereas the 655 includes only 1.
Both of them are not compatible with Lighthouses.

Extra Brushes
The 770 does not include any extra brushes while the 655 comes with 1 extra rubber brush, 1 extra bristle brush, and 1 side brush.

Weight
The 655 is lighter.
The 770 weighs 8.4 lbs while the 655 weighs 7.9 lbs.

New Design
You can see they have different design from the product images.

If you know more difference between the Roomba 655 and 770, please share your review below.

Here are some difference between Roomba 630 and 655.
Roomba 630 vs 655
images from manufacturer

As far as I know, the Roomba 655 is a Costco model whereas the 630 is a general model that you can buy from official site http://store.irobot.com and other online shopping malls such as Amazon.com and Walmart.com

Scheduling Feature
Both of them belong to the Roomba 600 series, however, the Roomba 630 has no scheduling function while 655 features On-board Scheduling that allows users to preset cleaning times.

Battery
The 655 uses the purple iRobot XLife Extended Life Battery doubles the cleaning cycles of the yellow iRobot Advanced Power System battery which is used on the 630.

More:
* According to iRobot, the 655 also comes with a redesigned side brush that cleans better and easier to remove.

* The 655 has the Dual Voltage Integrated Home Base whereas the 630 uses the Home Base (110V) and regular battery Charger.

* The 655 comes with 2 brush cleaning tools (1 round and 1 flat), 1 extra side brush, 1 extra rubber brush, 1 extra bristle brush, 2 C batteries for Virtual Wall whereas the 630 has only the flat brush cleaning tool, No extra brushes, no batteries for Virtual Wall.

P.S.
Both of them do NOT support Lighthouse that helps Roomba navigate room-to-room.

If you know other difference between Roomba 655 and 630, please share below to help others buy the right one.

The iRobot Roomba 585 was sold at Sam’s Club and Costco, and it has been discontinued. The 655 is available at Costco, it is a simlar model to the 650.
Here are some difference between Roomba 655 and 585.
Roomba 585 vs 655
images from manufacturer

There are 2 apparent difference that you can find easily from the faceplate.

1,
On-board Scheduling
The 655 has the on-board scheduling whereas the 585 is pretty basic and has no scheduling function.
With the scheduling feature, you can preset the cleaning times, then the Roomba will do its job at your desired time, even when you are not at home.

2,
Carrying Handle
The 655 has a handy built in carrying handle for easy transport while the 585 does not include.

Battery
The 655 uses the Xlife Extended Life Battery while the 585 uses the Advanced Power System Battery.
The Xlife battery doubles the time before you may need to replace the battery.

Side Brush
The 655 uses new brush design that’s claimed to be easier to removed.

If you know other difference between the Roomba 585 and 655, please comment below to share your reviews.

Here are some apparent difference between Roomba 595 and 655.
Roomba 595 vs 655
images from manufacturer

Carrying Handle
As you can see from the product images, the 655 includes a recessed carrying handle which is fitted on the top of the robot. Whereas the 595 do not have this carrying handle.

Battery
The 655 comes with the XLife Extended Life battery while the 595 uses the yellow advanced power system battery.
So, what’s the major difference between the Xlife and APS battery?
Here’s info from iRobot
“iRobot XLife Extended Life Battery delivers twice as many cleaning cycles as previous Roomba batteries, doubling the time before you may need to replace your Roomba battery.
*Roomba runtime remains the same between recharges. Battery lifetime varies with home environment and usage.”

Accessories
The 595 is one of the iRobot Roomba models that come with the most accessories.
It includes 2 Virtual Walls with 4 Duracell C batteries, 4 AeroVac filters, 3 Side Brushes, 3 Rubber Brush, 3 Bristle Brush.
While the 655 has only 1 Virtual Wall with 2 Duracell C batteries, 2 AeroVac filters, 2 Side Brushes, 2 Rubber Brush, 2 Bristle Brush.

Color
The faceplate of the 655 is Gray while it’s Black on the 595.

If you know more difference between these 2 iRobot Roomba robotic vacuum cleaners, please share your review here.