I have this since last 4 years. While I see bubbles on the seals and this makes me nervous, there are no leaks etc. Just cosmetic. My gripe is with the form factor itself. It's just difficult to get the flow and lighting right. Keeping both SPS and LPS happy is kind of tough. On top of that, I didn't pay attention to the sump when I bought it. As a result there is no room for reactors and algae scrubber, refugium etc. Get the cube only if you must and go slightly bigger if you can. So you can have more room in the stand.
