Love it!
In fact, I AM in the movies ... and I still won't have a shotgun with a pistol-grip-only (PGO) stock.
Well, technically, I'm not IN the movies; I work behind the scenes, training the folks who really ARE in the movies. When I am not making my living as a professional firearms instructor, I work with folks like Samuel L. Jackson and hundreds of others on the set of action movies.
I have been teaching advanced handgun and shotgun shooting skills to government, military, police and other professionals for years, so excuse me if I offer my opinion. No professional no matter how tight the space, would ever resort to a PGO stock. Hitting your target is just too important.
As far as folding stocks such as the Remington or Butler Creek ones pictured, anyone who has ever tried one has HATED it.
I have a Knoxx stock and eventually took it off because I could never get comfortable with it. Some people love them though.
But Grimor's shotgun has one majour advantage. That is one of the very few Remington shotguns that come with a full-length one-piece magazine tube. That solves a LOT of problems. But if it were mine, I would get that Knoxx off there and replace it with an Urbino stock if one wanted a pistol-grip, or a standard Remington or Speedfeed full stock if one didn't want a pistol grip.
Of course, here in Canada, we do have one advantage -- 14" barrels (and shorter) in pumps is perfectly legal, provided it came from the factory in that barrel length, and provided the overall length stays at 26" or longer. My personal bear gun is an 870 Police with a 14" Dlask barrel and a Mesa Tactical Urbino stock. Aside from the custom smoothing of certain action parts, that's it. The more one may need a shotgun in a hurry to save a human life, the less crap one should have hanging off it.
I am sure Sam Jackson would agree too. (In fact, I know he would.)