No right or wrong answer - I think it really depends on the game's shape, whether it's a keeper, etc... I touch up what I think I can do without looking obvious - pop circles are especially difficult, and take a LOT of time to do them right - nothing is worse than a crappy touch up job... if you can see the touchups, it's crappy IMO. Planking is the toughest to deal with - If you're gonna tackle hard-core planking that's a bitch and like pop circle surround work, it's tough and takes some serious time to do right. Just finished shopping a 4 Belles woodrail, and I had a big decision to make - spend a million hours getting the playfield pristine, or do nothing at all, as the playability is not affected by planking or other areas of wear; for this game I chose to leave as is, and glad that I did. Then again, I'm working on a Cleopatra EM, did a ton of touchups after taking off mylar - clear coated and its a keeper for me, at least for a few years; it's all good man, it's pinball...
YORK Baby, CANT FRIGGIN WAIT. Got my IPAs at the house and ready for the show.