So... to be clear, even with a late build (Oct 2014) and no visible problems, people generally recommend installing the mylar? I'm reasonably nervous about putting non-removable stickers on the playfield that has been treating me pretty well so far.
UPDATE - and people recommend "Wizards Mist N Shine" before doing it, that seems to be a line of products. Exactly which product, or more generally how do people specifically recommend caring for the WoZ? I've got around 1000 plays and haven't really done anything other than fix one or two out of box problems.