I've only had the Grip on the phone for a little while, but it's super nice. I may not even install the skin because I like the texture of the naked back.
It's a bit thicker than the Paragon, but not enough to make me not want to use it. I do find it interesting that DBrand removed the felt on the inside that sat against the back of the phone, but I don't think that makes it any less protective. The fit is so precise, too. All the camera, flash, and sensor openings are dead centered on everything.
For the sale price, it's 100% worth it.