I've got one that I installed myself. I only paid $4,587.00 for the supercharger. My local dealer wanted $10k installed. The most likely item to break is the transmission and a very good friend of mine is a transmission rebuilder that has severl 4l65E's running 10,s and even 9's on drag cars. I can get it rebuilt for parts only
I'd rather insure myself than pay $5k for what might happen.
I've put 250 miles on it since installation. Very happy overall, no problems after installation was completed. I'm getting about 11 mpg average with mixed town and highway. I was getting 12 mpg average before the install. The deal with the lost mpg is that I am in the boost a lot because I live in a very hilly area. I've always bought premium anyway so no big change there. It's only about 15 cents a gallon difference between 87 and 92 here. That's only $4.50 a tank - no big deal.
I'll be doing electric fans for sure on mine. That's good for 15-20 rwhp on most trucks. Gotta be good for the H2 as well.
Do it, you'll like it.
Cory