IMHO that article is flawed as it states
"but when you accelerate, opening the carburettor or throttle body butterfly - the manifold vacuum drops causing the Hyper-Charger's butterflies to close."
That is exactly opposite to what actually happens. Prior to starting the bike the butterflies are wide open, at idle and cruising speeds they are only slightly open because of the high vacuum pulling against the butterfly actuator. When the throttle is cracked open and the vacuum drops the butterflies open because there is not enough vacuum to hold the spring pressure.
I have had one on my ride for 8,000 kls. and never had a problem as noted in the article. I also have a K & N filter that was changed out for the hypercharger and the difference in power between the two is noticeable.
