Body weight: The weight of the AIM body is considerably lighter than the Stock 03' WGP body.
Anodizing: I got the solid black color and it looks pretty sweet.
Milling: The body is very boxy, lots of straight cuts.
The Angel threaded VF is a nice feature that really comes in handy. The body also comes with a 15 degree ASA and matching front block and rear block.
I bought this body off of ebay new from skullpaintball for only $179 and it came with WGP stock internals, WGP Hinge Frame and a six piece AIM barrel kit. This frame was a great upgrade which was really cheap. I'm very happy with the quality and design of the AIM17. If you like that boxy/STO type of style than I would definately recommend picking up one of these bodies. You can definately get one really cheap under $200, which is a bargain.