PSA is good to go. I've had a few of their rifles with no issues. In fact, my favorite rifle is built on a PSA lower. Mil spec says it all. Their storefront is only about 30 minutes from my home, and I go there often.
Yes their stuff is good. As stated above, make sure you buy their branded stuff, and when looking at their uppers buy the ones with the FN barrel. Their lowers and lower build kits have been good for me also. The last lower build kit I bought from them was a few weeks ago. It was a Magpul kit with an ACS-L stock, MOE grip, and MOE trigger housing for $139.99. Yes, that was a hell of a good deal!
They had Aimpoint PRO's on sale yesterday for $349.99 and shipping was $7.00. I just couldn't pas up ordering one.