Winchester SX-AR here for quite a few years now. It has a 20" unfluted barrel and wears Mossy Oak Brush pajamas. Same gun as the FNAR except no flutes. There is also a 18" barreled FNAR too. Disassembly is fairly complex. Magazines are expensive. Reliability has been 100%. Accuracy is 1MOA from factory. It is heavy, especially with good glass. Love hunting with mine even though it is heavy. Recoil is light, follow-ups are fast. Antelope, mule deer, white tails, yoddle-dogs - works great. Last speed goat I took with it was at 389 yards. Haven't taken bear or elk - yet - as I often opt to hunt with handgun.
If I didn't have one, I'd be all over a FNAR for under $1000. It is not a battle rifle. It is a tactical platform for a swat sniper or such role. It also makes for a darn nice hunting rifle, provided one doesn't mind the weight.