I am testing one of the first QSC Raptors and I can tell you this is going to be the clutch to have. It is smooth, runs quiet, has excellent mud tire turning /crawling / pulling ability, has engine braking as good as stock when used with STM secondary, has higher top speed potential than any other aftermarket clutch available, and is fully and easily tuneable just like the first generation QSC primary.
The main differences from the first Gen QSC primary are that it has larger dimeter sheaves that close further, double thickness parts in places where the old one has failed in the past, larger rollers, different weights