I've used Talon grips on a number of my Glocks, but always the granulate ones. I love them because they don't add any size to the grip. I've never tried the rubber versions because I didn't want to increase grip size. Right now I have a Gen 4, and the grip size, without any back straps installed, provides the best feel I have ever had in a Glock, so increasing grip size isn't in the equation. If the size difference is negligible, I might be inclined to give them a try.
The best defense is a good offense, and I'm really offensive.
SFC, U.S. Army, Retired 1971 - 1992
S&W Club #92, Snubbie club #92, The 21 Club #92