Each act per difficulty has a look.  So you have 16 looks (4x4).  

Been playing since day one.

Issues seen:

In game lag.

Some class in balance

I have had no lag in the videos.  I think the game feels and plays like diablo.  Its what i wanted.  This game will not get less than an 8 and it deserves nothing less than a 7.5 just based off launch issues.