I have 3 v221 cages and i like them. I however think seeing that you have a few balls allready, you might wanna consider a rack if you planning on purchasing more. Racks are easier to heat, and control humidity. Cleaning is soooooo fast and easy. I would look into Reptile Basics racks, or Jason Jungle racks, Animal Plastics too. The enclosed design is clean and compact, and retains heat well.

If you really like the vision cages, go for it, i have 4 six foot cages in my room, and 3 v221 cages and love them.