Got to play with one of these yesterday actually while I was hangin with some RRC boys (the PR, not the TPR, difference is a folding stock vs. the one pictured). Brand freakin new.
Unbelievably light, smooth as butter, stupid easy to break down, comes standard with folding BUIS and flash hider made to accept a quick attach suppressor (at least these ones came like that). Only thing I didn't like about it was manipulating the safety was a little awkward for me because its further forward than on an M4, but I have small hands and that can be solved with a different grip anyway.
After getting to handle it and spend some time with it, I'd buy one for sure.