I read somewhere that the average person can rarely distinguish less than a three cent variation in pitch, granted most musicians listen more clocely than the average person and can develope a "fine tuned ear," but most listeners are not as picky as we are. I guess what I'm getting at is, although precise intonation is great it is not always an absolute requirement. I do all of my own set up work, I've been doing it longer than a lot of techs have been alive so I've gotten pretty good at it from years of trial and error. I play mostly electric and one thing I've noticed that no one else has addressed is the fact that no matter how cloce the intonation is set on the guitar, if you plug into a different amp there will be a slight variation in the tonal reproduction and this will sometimes be sufficient to make a guitar sound off, anyone else ever notice this or is it just me and the crappy amps I've played through over the years?