I've got a 4x2x2 model, and I'm not very happy with it. The material is too thin for the size of the cage, and the pre-drilled holes weren't aligned quite right, so that made putting it together a bit of a pain. The door sticks due to sagging.
Figured I'd share for anyone else's benefit, though you've already decided against them. Depending on what you're housing, you may want to check out the cages on
www.deerfernfarms.com or the boaphile, barrs, or precision cages (for snakes, they have plexi doors, which medium or larger lizards would tear up with their claws).