Received my vest last week. As @MattP noted, the vest fits snugger in the waist, which I like. I purchased a Medium, and it fits very similar to my Eagle large. Also fits a bit more snug then my medium O'neill Slasher vest before it loosened up from usage.
The waste fit is snug to where it is a little tough to get the zipper started, but feels great once zipped. I expect it will loosen a bit with usage. I won't know for a while, it's a Christmas gift.