FYI, they are replacing the glass roof panel on my car. There is a small “lip” on the front edge abutting the windshield, a problem some S owners also reported a year ago when glass roofs were introduced. Some S owners claimed it made wind noise but I didn’t notice that in my 3 — though my hearing isn’t the best anyway. (The roof panel is also cut slightly narrower than the adjoining windshield and rear window probably about 1/16 inch or less on both sides, which seems odd but I don’t know if that is normal. One would think all three glass pieces would be cut to match exactly, right?)
I only posted this info in this thread to let you know that the metal roof option, if it happens, might be less problematic.