Merits or demerits of the design aside, if I'm spending $500 on an upper, it needs to come with a nice barrel, a good bcg, a decent hand guard and a bcm charging handle.
I would not shoot that. A standard A2 configuration will leak gas/smoke into your eye on a still day. That goofy thing would not be a riflemans rifle on any day. In my economy, it does not matter how "snazzy" something looks if it does not work right.