I really enjoy the flow it produces. Real water mover. However, I wish I had a second one on the opposite side and on opposite schedules to create a balance to the movement. It's so directional and basically produces a circular flow from right to left, down, back to the right. And all the corals follow this same flow so the top sways to the left, the bottom to the right (of course depending on the side of tank it is on). If I had a second one, I could have them turn on at different intervals and create more of a balance. Otherwise, it's a great wavemaker.
Fyi - get the foam covers for the wheels...critters do like to sneak in and if a anemone gets near it will get obliterated.