I have two sets of VZ grips. I have the 320S, in blasted black canvas I think. My buddy gave them to me with no packaging so I'm not sure. They are almost too slick and I rough them up with sand paper every year or so. The other set is the Frag in G10. They are good but a little rougher than I would like for concealed carry. Granted, I don't carry that pistol much. I'm sure they'd smooth out a little if I carried it more. Both sets have the thumb notch and are on 1911's with extended mag releases. This combo has caused some issues in a couple holsters. In my Crossbreed Supertuck, the mag release button was depressed by the holster, releasing the mag just enough that it wouldn't feed, but didn't fall out.
This didn't happen with a 1911 that has a standard mag release and factory grips. I trimmed the leather on the back of the Supertuck and it's fine now. I actually wish I wouldn't have gotten the thumb notch, as I feel it's too large and deep. I could just as easily have used my Dremel to put a smaller thumb notch in them and saved $4. I have been thinking about getting a set of 320s in G10, as I think they wouldn't get worn smooth as easily.
eta: I don't have small hands and don't "need" the thumb notch.