I've reserved and am waiting for a June 2015 CPO with the "All Glass Panoramic Roof". I had assumed that it was the same solid glass roof as is now offered in the Model S. But I was looking at the Options by Year TMC web page and found that the all-glass roof only started to be offered in June of 2016. The only other references were to a sun roof. Is the glass roof on my S just a fixed glass or is it a retracting sun roof? Frankly I was perfectly happy with the roof just being glass with no opening function, but I'd like to know what it is I'm getting. Have the sun roofs been solid without noise or leaking problems?