I've got a few ARs but don't really know about the inner workings. I've never read anything bad about them.
All the reviews I've read have been good. I think it's about on the same level as the S&W Sport ll
I was just reading some reviews which were good but one thing I noticed is that the barrel is not lined whereas I believe the S&W is melonite lined. Not sure if that makes much difference or not.