I suppose the answer to this might depend on what kind of shooter you are. If you're more a collector or you just like making brass, then you probably shoot a variety just to keep things interesting, but from a pure performance shooting perspective, once you've gone to a dot, are there situations where you still shoot irons? If so, when and why? Having just "dotted" my only G19, I'm giving some thought as to what that might mean for future pistols, or is everything going to have a dot from now on? Once we started running dots on carbines it was pretty much a no duh, and irons were only used to zero them and then usually folded out of the way forever. I never forgot how to use irons and when subsequently zeroing a new set had no issues shooting well with them, but in performance shooting of course the dot has advantages, so why go back? Then again, pistols and carbines are different animals.