My oly has about 1000 rounds through it and has been flawless so far. I had to sort out a magazine problem when it came out of the box, other than that not one failure. Shoots close to MOA if I do my part, that's not too bad for a carbine.
That being said when I called Oly to get some help with the magazine problem, I would get shuffled to voice mail [beeep] and am still waiting for a return call, been about a year. I would give their service dept. about an F rating, lifetime warranty is worthless if they won't talk to you.