friend of mine has the Ruger PCC. I've shot it a few times. its good and its cheaper than most PCC.
when he first got it, I put it together for him. the charging handle on the left side, installed the Glock mag adapter (also comes with the Ruger mag adapter installed), and installed the extended mag release which is also ambidextrous. all super easy to install, anybody can do it in a few minutes
I don't have a lot of experience shooting PCC's, so can't really compare it to an AR style PCC, other than the Ruger is cheaper
there were no failures with the Ruger. I think if I were to get into PCC, I would get the Ruger
trigger isn't so great, but there is an aftermarket one but its pretty expensive and I think that's the only one, but since I wouldn't be shooting bullseye competitions with it, maybe I could live with the stock trigger