I bought them for my turbo bike, if that's any indication on how I feel about it. :)
In all seriousness, aero is the name of the game after you're a 1/4 mile out.... ANYTHING you can do to reduce drag is going to play a more and more critical part in going faster at +150mph speeds than what you can reasonably do with power. The light weight is a nice bonus, but I'd rather add 10lbs and reduce the Coefficient of Drag (CoD) if at all possible. A practical example would be the 'ol original haybus... even being nearly 100lbs heavier AND down on power to the first few generations of ZX10R, they would actually start to lock (and reel in) the supersports once speeds got over 150... in stock trim no less.... I swear wouldn't believe it until I was the guy doing it.
Attack life... it's going to kill you anyway.