Show me one person in this thread that thinks it is a good idea, worth the money, cool, etc...
Ummmm.....Okay buddy, quoted directly from people that posted in THIS thread:

This guy thinks it's interesting:
hmm, this is interesting...a boost controller for a roots blower.
This guy would buy one if he had a smaller pulley
if i had a smaller pully id buy it just to try it
This guy thinks it might be good as a speeding deterrent
its also for people who u let borrow the car. extra added security even after a promise.
Bio flat out says it's pretty cool
i think it looks pretty cool actually,

Alrighty, there you go....now you may insert foot in mouth.