i've been thinking about changing them because i'll be tuning it up and then the tuning knobs will come loose and just turn, while not tightening or loosening the string. when the interior part of the tuner catches again and starts tuning, the string will then go way out of tune.
this particular jag-stang of mine is already no longer in stock condition, it has a tortoise shell pickguard and seymour duncan pickups.