I'm afraid this really didn't cut the mustard for me. I was expecting this mouse mat to provide a very smooth glide, but with high accuracy due to 3M's clever use of supposed micro-grooves ("Point, click and drag quickly, smoothly and accurately").
In reality, the mousing surface is more akin to fine sandpaper. It is rough to the touch and, in comparison to my old (smooth plastic) mouse mat, is very much noisier when moving a mouse across it. I feel sure that it would wear my mouse's feet down in next to no time. I don't feel that this is what one should reasonably expect from "micro-grooves".
This is a great shame, as the wrist rest looks as though it would have provided great support and been easy to keep clean (unlike the fabric covered rest on my old mat).
Unfortunately, due to the rough surface, this 3M mat is going back. If 3M could offer a similar mat, but with a very much smoother and quieter surface, I'd be very interested in buying it (preferably also at a more affordable price). In the meantime, my old mat gets a well-earned reprieve.