I had two visionariums. I sold one of them because I found that when they were stacked, the lower one had crazy high humidity levels. Other than that, they really are nice vivs. Also, when you have the divider in (not sure if you are planning on using one), one side of the glass rubs hard against it and makes a horrible noise.
Lots of pros of this viv though. I really like the sliding glass doors, so much better than a screen top. Aesthetically pleasing too. Very easy for sheds as well. I find when I cover the mesh portion on top thats for lights, the humidity stays in and makes for good sheds.
I just wish I knew about the humidity issues. I bought the visionariums so I could stack them, but now am not. I am not sure if it happens to everyone, I live in Colorado, definately not a high-humidity area.