I have a Kahr PM9.
I bought both the "rubber" and "sand" versions of the Decal Grip. I much prefer the rubber. The sand just didn't feel right to me.
I've only had it on for a couple of weeks, so I can't comment on durability of the Decal Grip or it's "stickiness". I was impressed with the quality of the die cut for my PM9. It matches EXACTLY with the contours of the PM9 factory grip. It is virtually undetectable when stuck to the gun.
It definitely adds to the gripability of the little PM9, without adding any measureable thickness.