Just got a set of these with the 320 texture. Quite like them. I have normal proportioned size large hands and these really fit me nicely. Love the width high on the back strap. Fit the J very well... and very tight. First couple o' R&Rs were a bit fiddly.
The 320 texture is similar to a light linen micarta kind of thing. Certainly won't abrade anything but does provide a pretty good hang in the hand. I'd like to try his Operator II texture which is the next step up in aggressiveness. Its a combination texture that sounds rather interesting. Money is short right now but that won't last forever and I'll try another set with that texture. Very happy with these right now though.
Pics compared to the S&W rubber combat grip for comparison. Apologies for their quality - I had to use direct flash to make 'em and that's never a friendly thing