I think RMorgan described it well also. I have fired at least 1000 rounds through my XD40 and I still love the way it shoots. I never had any period of adjustment with the trigger. I think I was able to stage it, so to speak, the first day I shot it. You can just kind of tell when the slack it removed and it is about to release.
There is only one good, knowledge, and one evil, ignorance.