Strangely enough, there is a whole school of thought that the pistol-gripped shotgun is inferior to a more traditionally gripped gun. The thinking is that you give up very little by having a stocked gun vs. a gun with only a pistol grip.
I agree. After using several different pistol grips, I decided to never do that again. However, last night/early this morning I woke up to male voices at a very unusual hour for my part of town, under my bedroom window. Granted, this may have been due to being a very deep sleeper that wakes up to human voices instantly. Which, bothers my wife to no end, but I digress...
Anyway, I rediscovered the simple fact that the benefit of the pistol grip, IMHO, is that is shortens the gun and makes it more compact. Obvious, I know, but it really helps if you don't want the extra 6-8 inches of gun to beat you around the corner. That said, they hurt like the dickens when you use the Mossberg-supplied grip on the 20 inch Model 500. And on a Remington 870 with a pistol grip stock. After seeing the Knoxx folder stock a few years ago, I serioulsy though about getting one. Now, I may have to.
If you can reduce the punishment to your hand, then I'd definitely go for it. Thanks MB.