I had an EDC X9 (4") Blue Gun arrive, and have been handling it in comparison to my Staccato P(4.5") Yellow(?) Gun. The Staccato is, I think, intended more as a holster mold, so some of the fine details are not as refined as the Wilson.
The X9 seems like a substantially smaller gun in the hand, and without the hot spots of the beavertail/thumb safety of the Staccato. I do notice, however, the "ledge" in the right side grip with my index finger inner knuckle. The grip is just barely long enough for me get my strong hand on it without my pinky finger having to rest on the magazine.
The overall flatness of the 2011 grip is nice, but it's still a gun with a very large grip. Fine for the hand, but without appropriate holster to find out for sure, it seems as though the Wilson would be a bit easier to conceal.