Since I have small hands and the muscles in my left hand aren't that strong, I tend to like the actions on my guitars as low as I can get them without buzzing, I've got a Squire P-Bass which I tried to set up to Fender P-Bass specs with the action at the 12th fret at 3mm, I find that if I try to play a guitar with a high action my left hand hurts when fretting notes.