thanks for the reply!
I inquired about the lifetime warranty covering scratches on the tint and they said it only covers fading, peeling, or large bubbling. I've had my A4 and my brothers 99 9-3 tinted there w/ maddico lifetime tint which is metallic (I believe) and was pleased with the results. But then again I'm getting a little annoyed by this tint shop as the guy who answered the phone was a complete moron and they raised their prices $20 and won't cut me any deal even though I've had 2 cars done and referred a handfull of people who went there.
I've heard mixed stories with AM reception, my Audi had the antanea built into the rear glass and I had no issues w/ the tinting.
When you say you had them change the rear glass did they just peel off the old tint or did you have a new piece of glass put in place as well? I was told by my tint shop that the rear glass is a one shot deal as they have to scuff the defroster to make the tint adhere and when they remove it the next piece will never sit right.
maybe I should shop around a bit more