If you're trying to figure out which Roomba to buy, the iRobot 650 gives you the navigation system that helps to get under and around your furniture as well as the 3 stage cleaning system. It can also be started by simply pushing the button on top or you can schedule it for up to 7 times per week. When it's running low on battery it automatically seeks out the charging station and docks itself so that it's recharged and ready to go when you want to use it the next time. It's short enough to fit under most furniture and it can adjust automatically to different floor types. It comes with 1 virtual wall barrier so you can stop it from entering places you don't want it and an extra filter so that it's ready to go even longer. The dirt detection is also able to find even dirtier sections of the floor and target these for advanced cleaning. Plus it can get edges and corners with the edge sweeping brush.
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