There are two schools of thought. Is competing with a handgun I.E.IPSC, USPSA, IDPA good training or does it instill bad habits? JIm Cirillo, the one time leader of the N.Y.P.D.'s famous stake out squad and veteran of something like 19 gunfights said the guys in his squad that did the best were either hunters or competition shooters. They both had experience shooting under pressure. I personally think it's great training as you get the pressure factor. Gun handling, marksmanship. Practice doing things like drawing smooth, fast and safe. Shooting on the move and reloading under pressure all within a framework of rules with consequences for breaking those rules.
There are those who think it instills bad habits such as moving too quickly through stages. Unrealistic scenarios and not utilizing cover and concealment. Do you compete? If so, what is your discipline and your thoughts?