I recently got one too and have no complaints. When running, the pump is quite noisy but because it only runs for a few seconds at once, it doesn't bother me.
One of the pumps acts as an ATO although it's not recommended because it wears down the pump..but my tank isn't large so I don't think it's too harmful. It pumps 70ml of FW/hr.
I tried to search for information on how much is too much to pump at once but didn't get any results. Anybody know the answer?
Found this pretty neat:
https://www.youtube.com/watch?v=vJ0qNlJpymk