How does the dark tint compare to the t-tops, similar amount? And yes, any scratches will often be more visible after.
Did they do the rear glass in one piece or split down the middle? I remember chatting to a tint guy maybe 10yrs ago when getting another car done. He asked if it was the type with the large wraparound glass, looked horrified when I confirmed. Suggested it could take several attempts and that I should just settle for a rear louvre!