I’m not sure if any R2s have made it into the wild. Keep in mind the only difference between resonator first gen and 2nd gen (R2) is the end cap (milling for flash hider properties) and the rear being modular for different mounts (1.375 x 24). The whole baffle stack and internals are the same, so the core performance should be the same... which is to say excellent. So you should really just ask For feedback, search reviews, etc. on any resonator (original or R2).
It has some of the highest suppression (dB reduction) amongst the cans silencershop has tested (see their “range time” YouTube test video and compare to competitors “Range time” video).