Got my glass roof shade in today. It fits very well once you get all the corners and clips up. Comes with a nice bag for storage during the winter. Never felt the need for this in my S, but I had the pano roof that I could vent during the day plus overheat protection so it didn't seem to get as hot as my 3. Hoping this helps reduce some of the heat load. (I do have 3M 70 Crystalline on the windows plus roof as well). Here is what it looks like. Doesn't noticeably reduce the headroom. Will report back after a few hot days and see if it seems to help.