Mine work great(I have 3, getting 4 after my 350 avrives this week) I gues it is a matter of getting a good one an opion.. IMO I really like them but that is just me...I would do ac110 over penguin any day. We have 2 and I hate them lol I don't even use them on my big tank, I use them on the 30
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I would at least consider 2 penguin 350s instead of 1 AC... same price too get 2 penguins or 1 AC...Ok yeah I'm going with my first idea since it comes with the emperor and I'm gunna get an aquaclear
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when I had my 120g, I ran 2 ac110's and I was not disapointed at all. The best filter for media imo