Shok-Buffs? Some shooters like them and some don't. I don't. Make your choice and go for it. In the last 2 years I bought 4 new Wilson 1911 pistols and they all came with shok-buffs. First thing I did was remove them. Called Wilson customer service and asked for their opinion/comment. Answer was: "No problem. Some shooters like them and some don't. Will NOT affect your pistol warranty."
Sometimes they can cause problems if the spring is on the long side. They can also shred from recoil and fill the recoil channel with pieces of plastic. Doesn't do the funtion of the pistol any good when that happens. Good luck with your choice.
Good shooting and be safe.