I own a 880 and 760 and I could not be happier with both of them. I had the 760 for over a year, but it couldn't properly do my entire upstairs (its rather large). So I moved it to my two room downstairs and bought the 880. With the 880 it comes with lighthouses that signal the roomba to know to do each room separately. I can not be happier. The 880 was a great upgrade too, the brushes are easier than ever to clear and maintain (basically you don't have to).

Another Roomba 650 owner here! Mine was $280 purchased from eBay, in March.

I also have a Roomba 555 bought for $200 in 2012. I spent about $100 to upgrade the older one to the newer sweeper/dustbin and to buy a new battery.

Love them both! Could not imagine life without them. To press a button, leave, and come back to a parked Roomba with a full dustbin is glorious!

The amazing thing is that they actually do a better job then using a broom and dustpan.

I just got my first 650 yesterday. I was recommended away from the more expensive models because for a home as small as mine, the features didn't make sense for the price.

It's running right now, and with two dogs and a cat my floor is rarely ever this clean.