Hmm having a dark VKool is for aesthetics purpose only lah.
Anyway dunno if the effect will be the same for diiferent shades as
it depends on the heat rejection figures i think. You would need to
check with the sales person on the type you were quoted. But based
on experience from friends and relatives, if you park your car
under the hot sun for the whole day, the effect might not be so
pronounced. They were telling me that the inside temp might have
accumulated (as if got no window film) after such a long day. But
they also commented that for short time under the sun it sure
helps. And dunno if it is psychological, somehow the car seems to
be cooled faster. 
