I have one. It's a good filter with lots of room for media. If I didn't switch all my HOBs to aquaclears, I'd still be using it. In fact, if I can find a place to put another quarantine tank, I KNOW I'll be using it
I am going to try to get my Magnum 350 working to put with my topfin power 60 on my 55 gallon, but if I can't get it working i think i am going to buy one of these. The aqua clears are really nice but I'm already over budget on my 55 gallon build and the foster and smith price is excellent at $30 for the 75 gallon filtration capacity.
EDIT: So it turns out it is a rebrand of the Imagine Bio System filter, which sells on amazon for $60 for the size FSA sells for 30.