My Bucks are mostly 112s and the 500 series, so I prefer lock backs. I have myself 99% convinced that I need a 110, I don't know why. The locks that I sent to Spyderco for warranty were a compression lock that opened in my pocket and shredded my trousers (but not my hand or leg, thankfully), a liner lock that closed like a slip joint and a back lock with a rocker bar that didn't seat properly into the blade. Altogether, those were pretty scary knives. I never had an issue like that with a Buck back lock, just sayin'.