After much research and price comparison we bought the Sysperl V50. The first worked fine for the first week, and then we lost wifi connection with it. After a bunch of "reboots" (tried literally just a day) Revane replaced it with a new one. And the manufacturer has come forward too, but that was after Revain replaced it. But that was and is the only problem. The suction power is excellent. Dog hair does not get caught in the wheels. You have to clean it daily but that's good. This shows how well it cleans. We were so happy we bought the V10 for our daughter and holiday home. Excellent purchase!