Instruct: Classify the given review as either positive or negative.
Query: Cool product, but it can fall down stairs

What a fun first robot! This is a great little device that does a nice job of vacuuming the floors relatively quietly and effortlessly. One problem, though, is that it actually can fall down the stairs. The first time I tried it was on a hard floor, and the stairs were avoided by the unit. However, on it's second run (after cleaning it out, of course) I tried it upstairs on the berber carpeting, and went downstairs to watch TV (sans bon bons) as my work was being done for me. When I heard a crashing on the stairs, I jumped up and ran over just in time to catch the Roomba before it smashed on the tile. So, don't believe that it's infallible....at least they won't take over the human race like in the movies, but I'm glad they can perform some basic tasks.