dgpcolorado
high altitude member
The metal roof with insulation likely won't dampen sound very much because it is expected to be just a narrow strip over the front seat passengers. Might also look rather odd; we haven't seen any pictures yet, so far as I am aware.My Model X windshield causes too much glare in my eyes during certain times of day - hence the fabric sunshade. On the Model 3 I would like the non-glass roof, mainly because I assume it will result in a quieter cabin.
Glare is also a concern of mine due to remnants of cataracts. I drive with the visor down pretty much all the time during the day to reduce the glare somewhat.