I own a Kahr/AO 1911TC (the stainless version) and it has been out of the box the best 1911 I have owned, and at 9k rounds, it's still going strong.
Since Kahr bought them, I have heard nothing but good things about AO.
last year, after going back and forth for a coupla years with some shooting buddies over how horrible the series 80 system was, we set up a blind test with five weapons- two Series 80, two 70 type, and one kimber.
No one (out of 4 experienced pistolaros) could reliably tell the difference in any of the systems.
I don't know anyone personally that has had a malf due to the series 80 system. I recognise that more parts= more troubles, but I haven't seen it yet.