28% of people on the forum use them including myself. Imo Aquariums are bad not terrarium/viv's. It also depends on how well you care for your chameleon.
I'm only using it cause he's a baby. I already have a 2x2x4 foot reptibreeze for when he gets a bit bigger. I actually was going to set it up the other day only to find there were no screws (there should have been but i got it second hand and they must have forgot to put them back in the box). So now I need to go find some the right size and also buy more vines and some more plants to fill up the tall cage.