We had a Pentair 820 and it did a fantastic job, so naturally, when it died we bought another Pentair newer model 920. WHAT A MISTAKE. Filters on the 920 are way easier to clean, but that's it. No power cord strain relief grip, does not not vacuum as well. We are running it 3 days a week to clean pool. biggest problem is it does not climb the side very well, lots of slipping and falling back down. Also it will try to climb out of the pool but just sits half in water half out just spinning, sure that is putting lots of wear on it.