I like the idea of the new grips as it gives more options, but the reality is that I find very little reason to pick any of the new ones over the Recoil grip. I would suggest adding a new accessory type like a sling and moving over some of the grips to that instead. This would allow more flexibility as you could get both the Recoil Grip and say a Fast reload sling at the same time if you wanted.

Just a thought...