Pleased with the performance. Couldnt hear the pump at all. Even without water. Water trickling down the corrugated panel is simply mesmerizing. The stones it came with is just enough. I dont need to add more nor replace them. The only negative would be the smell of the slate (if it is slate). Its earthy. Wipe it down with a damp cloth and itll be less noticeable. Im pleased with my purchase.