Variable Window tint: Would you use in 911?

[RickM]

This would seem to make more sense to use in hot climates but others prefer the privacy as well. Are there applications for racing?

It looks to be a film that is laminated into glass. Perhaps in Lexan as well. Looks like an opportunity for a company to make retrofit windows.

http://www.refr-spd.com/index.html

IMO, if this could be produced in external film form and applied as the current stuff you'd have a huge seller.