I would love a glass roof - but at that price I would rather have Steve's bumpers and get them painted - especially as the wife hit the front lip of our current front bumper !!
The glass roofs apparently leak more than the std hardtop - and mine has been fine for the last couple of months! - they also have different seals and I would need to change the seals to make it fit mine.
As I understand it this is because the windows drop when closing the doors and once the doors are shut the windows go up into the seals as opposed to resting against the seals as they do in my car !