I was using Wilson Shock Buffs in my Custom Classic when I took John Farnam's Defensive Pistol class this summer. John teaches the slingshot technique for releasing the slide and my Classic's slide wouldn't release with the buffer installed. I think John is right in stressing use of the slingshot (a gross motor skill that works under stress) so I gave up using the shock buffer in the Classic.
However, in my carry gun, a Pro CDP, I use the same shock buff because I'm able to use the slingshot with it even with the buff installed. Given the Pro CDP's aluminum frame, the shock buff gives me some peace of mind that I'm protecting the frame while practicing.
I ran one Wilson shock buff in the Custom Classic for over 1000 rounds and other than looking a bit compressed it held up very well. No signs of shredding at all.