Got to put a box of shells through my new toy this weekend. Unfortunately it wasn't in any organized fashion. We were shooting at a stump off my back deck, so don't ask for details on patterning. LOL
First, this thing is ridiculously fun to shoot, and it's impossible not to look cool holding it!
Second, recoil isn't as bad as I expected. I actually feel more of it in my front hand (on the fore end) than I do holding the Raptor grip.
Third, shooting it one-handed is POSSIBLE, but not recommended. Not for the reason you might think, though. The recoil isn't awful, but because there's nothing holding the slide forward, and since pulling the trigger unlocks said slide, you end up with a partially racked slide after firing. This didn't cause any malfunctions, and a good solid rack to the rear ejected the spent shells just fine, though.
Fourth, I may look in to doing something to enhance the grippy-ness of the Raptor grip. It's an extremely solid piece of kit, but it's a little smooth under the hand. I haven't decided just what to do yet, though. Maybe I'll Book of Eli it and do a wrap of some sort.