Hmm not heard much about Procharger, looking at their web site there is not much technical details in particuarl no maps of the compressors, although looking at the picture of the impeller on the site there's not much backsweep on the blades so you'll get good pressure ratio (boost) but poor efficiency (lots of heat) which figures from the need for intercooling.
The conversion itself looks like something me and stu where discussing but using rotrex, IMO a better product as they have epicyclic gearng and use the compressors from my old company (ive got a picture of one on a Honda K20A that says Holset on the cover, they are also OEM on the konigsegggesewferedssws). Not sure how they stack up on price but those kits seem expensive for what is essnsially a charger, belt and bracket.