Expensive and shiny - LANTAC Enhanced Full Auto Style .223/5.56 Bolt Carrier Group (BCG)

This feels premium, shiny and heavy.
I don't have enough experience with bcgs to give a very in depth review. It shoots and I didn't have any problems with it out of the box.
My build
Aero Upper
13.9" Rosco Barrel w/ mid length gas tube
Superlative adjustable gas block
Carbine weight buffer with super 42 Geissle Spring
3-4 o'clock ejections consistent with the gas block fully open and not gassy at all if lantacs design is responsible or the gas block makes it work well I could not tell you.
I would recommend this bcg but I could not say that it is worth the premium pricepoint just that it works without hiccups.