They are one of the best of the factory guns IMHO. Very reliable, very well made, accurate, without breaking the bank. Pat Rogers agrees, and that should tell you something.
I also nave an OR model, I used as a starting point, DD Omega rail, YHM folding site/gas block, LMT stock, Magpul triggergaurd, CAA G27, TD QD VFG , ambi controls, Troy M&P buis. I love it, 750 or so down the pipe now, not one failure to anything, feed, fire, eject, anything.
You might read some minor complaints, PMags don't work, built by stag, etc.... This is for PRE 50xxx rifles, all post 50k are built in house by S&W, they are one of the few places to have thier own forge. Bolts are rumored to be LMT, looks like it to me, barrels are Thompson Center (S&W owns them). PMags seat and drop free just fine on any of the newer rifles.