Stern games in my collection:
SM - No playfield wear, no insert issues.
Tron - No playfield wear, no insert issues.
AC/DC Premium - No playfield wear, no insert issues.
IM - No playfield wear, no insert issues.
GB LE - No playfield wear, no insert issues (already have over 300 games on it).
Either I'm lucky, or people with issues are unlucky. I hope it's the latter, because I'd hate to be the exception to this sort of problem.