I have always used shok buffs in my guns. I should also add that all my 1911's are commander length, and I have never had a single problem relating to their use. I agree with Hilton about keeping good recoil springs in your gun. I also believe in "extra - power" recoil springs (ie, using the heaviest spring that will still allow your gun to function reliably).
Again as Hilton mentioned, the key is reliable operation. It doesn't mattter what accessory you add to your gun - if it doesn't run with the option installed, then remove it.
Again as Hilton mentioned, the key is reliable operation. It doesn't mattter what accessory you add to your gun - if it doesn't run with the option installed, then remove it.