Negative supercharging in the outback??

I'm not going to bag on something because it's from Australia. The Australian members on this forum are some of the most loyal Mopar followers out there. But here's my take on this negative supercharger thing. Let's use the "stage 3" kit as an example.
http://www.impulsengine.com/kits/fullkit-stage3.shtml
The kit claims 500 lbs/ft and 340 HP for a 360.

1) The cost in US $'s is $3,720. You can buy a supercharger kit for the same amount of $'s or less and achieve the same torque figures and more HP.
2) There seems to be a whole lot of parts in the NPS kit, more than a positive supercharger kit. This translates to more work for less gain than a comparable, traditional roots or centrifugal type supercharger.
3) Narrow powerband range 1500-4500 RPMs. This (IMO) would seem more benificial in towing situations vs racing. This is not necessarily a drawback if the NPS target market is in towing.
4) In the 1 example where they compared a stock 2000 Subaru WRX Turbo vs an NPS modified Hemi 6. This is an apples to oranges comparison. I would be more convinced if the test compared the NPS Hemi 6 car vs a more traditional supercharged Hemi 6 of comparable value.

I must add that this company seems to have put a lot of research into this and may be onto something. But I don't see advantages yet. Hopefully, someone from this company can chime in.

Just my .02 cents.