Here's my Mossy 500 Tactical. I paid a little over $300 for it plus $100 for the light. I love the pistol grip, kinda reminds me of holding my... pistol
I find that when bringing the shotgun to ready position, the pistol grip helps me to quickly register my trigger hand. For example, mine leans against the wall next to my bed; when I grab it quickly, the first thing I grab is the forearm of the gun. As I bring it up, I grab the pistol grip and I'm ready. I just feel like I can be ready to fire a hair quicker with the pistol grip 'cause my hand is exactly where it needs to be.