I have two exo terra flexariums, I used to house a male and a female veiled in each, they are quite flimsy. After not even a year the stitching near the zipper was catching every time i would close it up, and drainage is not really made for them, the mesh does not alow water to pass through very easily. I tried a dripper on top when i first got them and the water would just pool on the mesh. Also because of the tight mesh, i found i needed a lot of additional lighting to illuminate the cage to my liking (Which also contributes to less UV passing through the mesh, so if you do go that route i would suggest a 10.0 uvb light)
I have since switched to the LLL aluminum screen cages. And all round there a better enclosure in my opinion. Personally i think there better looking too. There sturdy. Easier to put together then the mesh ones!!! And the cages are made for setting up drainage, alot easier to drill a couple holes in the bottom then cut that mesh off and potentially ruin the cage.
I still have my flexariums which i use in the summer months when i take my chams outside. But that's about all I'd use them for now.