We have the Sta Rite Lil Shark and are pretty happy with it, except that the 30' hose is not long enough for a 33' pool. Only one moving part, a 0(wide)-4(small) for settings/patterns - works on suction side, doesn't stir anything up, but like any of these, if you have a ladder, it will "stall" underneath as it gets stuck there - have something there for it to bounce off of and your ok.