I got one as a Christmas present and went the SBR route with it. Very good fit and finish and I think you could use the milled receiver as a hammer, to say its heavy duty is an understatement. I mounted a 7.5" ace side folder using the us machine gun mount (it uses the threaded hole from the rear sling mount so no need for drilling and taping). I also threw a PWS comp on it that killed most of the muzzle flip (to me it feels like a non compensated AR).
I have about 500 rounds of mixed brown bear and tula through it with no failures (other than a crappy tapco magazine that wont feed soft point brown bear).
It has the "shark fin" front sight that at first I didn't like but it grew on me pretty quick. The polymer quad rail is alright, but I think ill replace it with an aluminum one when us machine gun finally comes out with theirs. The grip is also alright, but IMHO the magpul one fills my hand better.
It's my first AK so I was prepared for softball groups at 100 yards, I've been pleasantly surprised by 1.5" MOA. I'm thinking the short rigid barrel, stiff receiver and tapco trigger really help the gun out.
PSA, a Larue hand stop turned around backwards on the bottom rail makes a great low profile finger hold, when you want to do rapid fire stuff, that doesn't get in the way when you do mag changes.