Warantee is key I had an Audi 5000S years ago and man I tell you after the first 3000 dallor oput of warantee repair it was see you later car. It seemed that where ever you took it for repair it was lots of dough to make it go.
Yeah Rear window leaked bout 3 days after I picked it up from the Dealer they removed and resealed rear quarters and rear window have not had a problem since.
Tint the darker the better I have 35% on all my cars and have not had a problem yet. If you getpulled over roll down the windows and the cops dont care at least aroun here anyway.