Quote Originally Posted by ufufu View Post
You could always just open your Character tab and put it next to whatever tab has the gear you're looking at.
Pretty sure this doesn't work. I.e. opening the character tab will close whatever preview you have open at the vendor, and vice versa.

The +/- system for defensive stats works well. Should be pretty simple to do it for other stats too.

Sorry i'm derailing the thread a bit. Isn't there some sort of model viewer out there that would accomplish what the OP is after? I know it's not in game, but this might suit the purpose in the short term.