Brakes heat up very quickly.
Go over a pothole, you better pray it doesn't crack.
Under heavy braking, the glass will experience high stress and strain forces - wonder how long is its lifespan.
But I have to admit, that seriously freaking cool :D
By the way, check out this USD 1 Million bux rim recently displayed at the SEMA 2005.
(via supercars.net)
http://www.supercars.net/gallery/119513/16/1814.jpg
Diamonds, man. Imagine the diamonds going loose while you're driving, the road will be glittering with diamonds!