I've had both the exo and the exo2.
I wouldn't reccomend the exo -- it was loose-fitting in places, it attratcted dirt like mad, and worst of all was the mounting post for the belt clip (which sucked in and of itself) stuck out SOOO far from the back of the iPod.
The new one is way better, and the belt clip is great, either vertical or hoironztal. The fit is great, and the screen protector is fantastic... which it wasn't with the first-generation.
When I ordered the exo, it didn't come with the screen protector because of launch delay problems, which plagued the product. They promised is shortly. I e-mailed them asking where it was three weeks later, and got an e-mail back minutes later promising "soon." It showed up in a week or two after that.
No such problems with the exo2 -- it shipped complete and intact.