We will compare Roomba 790 and 770 below and show you the difference between these two vacuum cleaning robots.

Roomba 790 VS. 770
images from manufacturer

Price:
The Roomba 790 is $200 more expensive than the 770.
The Roomba 770 costs $499.99 whereas the 790 costs $699.99 (on 2013-02-05). You can check the prices by visiting irobot.com

Control Tools:
The 770 has an infrared remote control whereas the 790 includes a wireless command center. These tools are used to control the robotic vacuum cleaners without getting them up. You can also use the wireless command center to schedule the Roomba 790 to vacuum on any time you want it to run.

Virtual Walls or Virtual Wall Lighthouses:
The 770 comes with 2 virtual walls while the 790 comes with 3 virtual wall lighthouses. The virtual wall lighthouses can navigate the robot from one room to another, while the virtual wall doesn’t have this ability.

Control Panel:
The 770 uses buttons to control while the 790 eliminates buttons and features a Touchpad control to let you control the robot without pressing buttons.

Screwdriver:
The 790 package includes a screwdriver while the 770 doesn’t.

Storage Case:
The 790 package includes a carrying case.

Amount of Extra Filters:
The 790 comes with 3 extra sets of dual HEPA filters while the 770 has only 1.

Extra Brushes:
The 770 comes with no extra brush, whereas the 790 comes with 3 extra side brushes, 2 extra beater brushes, 2 extra bristle brushes.

Simlarities:
• Dimensions are 13.9″ in diameter, 3.6″ in height.
• Both weigh 8.4 pounds.
• They both have the on-board scheduling functionality.
• Features Dirt Detect Series 2 technology that uses optical and acoustic sensors to locate debris and dirt.
• Persistent Pass Cleaning Method uses a back-and-forth cleaning motion that mimics the way you vacuum.
• Both use AeroVac Series 2 bin that can hold more dirt than standard bin, and help pull hair off brushes into the bin.
• Have a full bin indicator.
• Come with 2 brush cleaning tools.
• Use dual HEPA filters to capture small particles.
• Have the Soft-Touch Bumper that alleviate the robot bump on objects.

Where to buy iRobot roomba 790 and 770?
You can buy at iRobot.com, here is the link to the product detail page, if the link not work, you can visit irobot.com to search.
For the 770, you can also get it from online stores like Amazon.com

Please share your advice below if own the iRobot Roomba 770 and 790.