I've got the 500 and I love it. Mine was the field/home combo so it came with a full wood stock and a 28" barrel with changeable chokes and a 18.5" barrel and a pistol grip for home defense. I had the pistol grip on it for a while but eventually went to keeping the stock on it full time. Even at 10ft it is difficult to aim where you want. Alot of people say you don't aim a shotgun, you point it. At 10ft 9 00 buck pellets spread out about 2 inches. You still need to aim it. Forget about the pistol grip and get a stock.
If you want, pick up a cheap pistol grip and try it out. Its a novelty thing, that's about it. I still put the pistol grip on mine occasionally just for fun.