JJP finally got things right with Toy Story 4 but does have a history of playfield issues affecting early builds. Below are the playfield issues by game to the best of my knowledge after buying all of their pins over the past 10 years.
Lesson: If possible make playfields like those on Hobbit (likely a no today sadly as there's been a move from silkscreen to digital printing), remove artwork around posts (Stern has done this as well), and as a customer wait 6 months before buying to prevent issues with early builds.
1. WOZ: Very early Bader made playfields didn't have mylar installed between the pops, in front of the back drop target, and around the State Fair pop bumper which caused playfield wear down to the wood in some cases. JJP later released mylar kits for games which prevented the wear (should have been installed at the factory), and eventually switched playfield manufactures (Bader to Micro). Sticker kits were offered to some owners where the playfield had worn down to the wood.
2. Hobbit: The only JJP game not to suffer from playfield issues across any build, easily the best playfield JJP ever made IMO. Hobbit may have been the last silkscreened Micro playfield that JJP used. Artwork is removed around pretty much every single post, something JJP later stopped doing for a while.
3. Dialed In: Early Dialed In's suffered from chipping at the SIM card and phone scoops, initial games didn't have protectors at these area. Later builds had JJP factory protectors installed which didn't work great, think they eventually switched to official Cliffy protectors for those two areas?
4. Pirates: Early build games suffered from severe pooling / chipping around posts, later builds didn't appear to be as affected
5. Wonka: Same as above, early build games suffered from pooling / chipping around posts. Final build games came with washers installed around troublesome posts to prevent the issue.
6. Guns and Roses: Same as Wonka with early build games suffering the most from pooling / chipping, including many CE builds. Starting in June / July of 2021 games started shipping with washers and a different type of posts in troublesome areas to prevent the issue.
7. Toy Story 4: No playfield issues reported, washers installed from factory (possibly using same post combo as GNR), and artwork finally removed again around many posts.