The problems I've read from the tank is the evaporation rate (because its topless), and the filter hole (which can be easily fixed).
Your going to have evaporation because its a rimless tank, and you will always have evap anyway. As for the jumping problem, they make a lid for this tank. Or you can craft one for yourself out of craft mesh.
There was a pro lem wth fish getting stuck in a hole(I believe) where the filter sucks in, but that was remedied with a piece of sponge in the hole.
I don't have this tank, but I do love how it looks. (: