I have two of those and I hate them.
Got them in December. One of the light settings on one of them burned out after a month. The light fixtures on both are corroding. The shape means that whatever you put in it will become lost in the curve for probably 2/3 of the way around, and will be distorted when you can see it. My cats were constantly knocking the lids off. The tube up the middle is a nightmare for decorating, and the water movement with the bubbler on bothered the bettas so I eventually just tossed the whole passive filter. And the lights on mine at least just were not really bright enough for either displaying the fish well or to be able to support plants.
I have moved one of the bettas out into a Minibow 2.5 and will be doing the same for the second one soon - that boy has a light case of finrot I'm treating, soon as he's recovered, he's moving out of that thing. I'll keep one around as a QT tank.
I love my Minibow 2.5's (cats have so far proved unable to budge the cover) and my Marineland Crescent 3 (not catproof, but that's the one I have in my cat-free office).
Last edited by Shadyr; 06-19-2012 at 08:02 AM.
Reason: adding another reason I hate them!