I have one but quit using it. It does do a good job of keeping the surface clear, but does have the following problems:
1. It clogs constantly, especially dead leaves if you have live plants.
2. It sucks in floating food, so you have to close it during feeding.
3. It sucks in small surface-swimming fish. Not pretty.
4. It works best when the float is pointing up, so when the water level goes down, it needs to be adjusted.
Summary - it may be more trouble than it's worth in those circumstances. Hope this helps. I'll sell you mine if you still want one.