I use them in my 1911s ,i have never had any problems associated to shok buffs in my guns.Depending on which ones you use they might have to be changed more frequently.In my opinion they do work but its not gonna be super noticeable.I didnt start using them for recoil ,i use them for protection of battering parts.And if you ask ten smiths the same question youll get ten different answers.My smith uses them in all his 1911s.Ive heard of them braking apart in guns and causing malfunctions.Ive never had that issue with about 3000 rounds through my 1911s.I use wilsons and i change them out when i see theyre getting beat up bad.Hope i could help!