even though I seldom shoot them, the answer is yes. some people feel it gives you more recoil control ability (not so sure about that), but the big reason is so that you don't go under it and accidentally flick it back on. I've seen that happen so many times it's amazing. and not just new shooters. IPSC Nats in Barrie, I was working the trenches and a shooter with more than 30 years experience shooting a 1911, and had been shooting IPSC since it's first days in Canada, stepped up to the line, fired his first shot and had a jam. after the RO gave him his time to try to clear it, he couldn't and asked the RO for help. The RO simply said, "Take your safety off". you should've seen the look on his face. although he had a better look moments later when we went to score and saw that the one A hit he had on the only target he'd engaged at about 3ft, had been taped by one of the tape technicians. RESHOOT! needless to say he shoots with his thumb on top of the safety now.