I have one and so does a good friend (we went together and bought kits). They are 20 inch heavy barrels and they both shoot MOA out of the box.
What I don't like about them:
(1)The stock trigger is heavy and creepy, but then so are most ARs - I replaced mine with a Jewell.
(2)The free-float tube is knurled and it's sharp, I don't like that.
(3)The non-fluted 20 inch bull barrel is too muzzle-heavy and overweight for me to shoot comfortably while walking.
Now 2 and 3 were my own choice when buying, not Olympic's fault.
Olympic makes all of their own parts and does their own machine work, and they tend to be on the minimum end of the spec range, so you may find that some magazines won't drop free as easily as from a "sloppier" receiver. They also tend to have a chamber that's on the tight side. I have never had any problems with factory ammo and I use a small-base die when reloading, which works fine.
I had D-tech build me a fluted 20 inch SUM upper with a fluted free-float tube which corrected 2 and 3, and am using my Olympic lower with a Jewell trigger, which corrected 1, and I'm happy as could be with my Oly. It looks good, it's tight and it drives tacks out to 450 yards.
I'd buy another one over anything on the market, personally. If you bought their stripped lower and a good trigger you could put together a very nice rifle for a fair price. Lots of people run that knurled tube so you might like that, too.
This is the same rifle I originally had, except I chose the chromemoly barrel instead of stainless.
Oly K8 Targetmatch