I've got one; can't speak on accuracy though. I haven't shot it yet.
If your looking to run a bull barrel I'd definitely recommend a fluted or lightened barrel. Mine isn't and it is one heavy mother, it's OK though since it will be supported with a bi pod most of the time anyways.
IIRC I paid about $413 for my lo-pro DPMS upper from midwayusa. It's got a FF tube, & railed gas block.
I slapped a Simmons WTC 6.5-20X scope, a Harris Bi-pod on it and called it done. So far my only real complaint on it is that it is chambered for .223 VS 5.56; and fit was really tight on my Stag lower.