iRobot Roomba 640 Robot Vacuum Cleaner

As of this review, we've owned two Irobot 600 series Roombas for 5-6 months. Using nothing more than a little common sense, it only took a couple of runs to figure out what needed to be moved around or blocked off. The upstairs level of our house has 3 bedroom 2 baths, and tile floored kitchen. A fluffy snow white American Eskimo dog roams our house. For a while, we ran the Roomba 3-5 times a week. It won't get the carpets as clean in one vacuuming as our conventional vacum, but with a full recharge, with one flick of a button, we can run it over -all- 1700 square feet of our upper level as many times/week as we desire. It does well autodocking, only needing help about 1 time out of 10 runs. It takes less than 2 hours for a full recharge, and it's ready to go again. Because we can let it run several times a week, our carpeted floors are cleaner and more free of fluffy white dog hair than we ever were able to achieve with a once/week conventional vacuming. As designed to, it works fine on our tiled kitchen floors, not being necessary swiftered near as often. We also purchased one to run on our lower level of rec room, two bedrooms, one office. Same results, except we don't run it in our large tiled utility/laundry room where the AC/Furnace, two hot water heaters, washer/dryer and water softener paraphernalia offer too many nooks and crannies for the Roomba to get lost/stuck in. Oh yeah, even though one of our Roombas can be setup to auto start, we run both the upstairs and downstairs iRobots with a manual start.