They use ASA superchargers as the base for their kits, ASA are fairly well established and reliable products although I personally prefer Vortech chargers and the Lysholm twinscrew units used by ESS.
Stage 1 power for the 3.0 is quoted at 320hp and 290 ft lbs torque at 6.5 psi boost.
Stage 2 is 330hp and 300ft lbs torque using 8psi boost.
Yup, I tend to agree but bare in mind both VF and ESS are simply suppliers. VF and ESS both use the Vortech supercharger as a base for their kits and ESS also use the Lysholm Twinscrew. Those are probably the two best engineered s/c units on the market IMO.