First off, it has a very nice build quality and feels very durable. The steel cylinder gives the body a nice look and the trigger feels very snappy. I did have quite a time trying to fit it into a DBOYS receiver, but with a little work it finally fit. Let it be duly noted that this shell fits into some receivers very, VERY tightly. I had a lot of difficulty with it. It did make up for it in performance though. I let it run with a 1/4 charged 9.6V battery and got at least 20RPS off of it, at somewhere around 430fps. So it's very good for a DMR build or a longer ranged rifle. Speaking of batteries...it uses mini tamiya type connectors by the way. But I feel that the battery wires extending out the back of the gearbox are a little too short.
Overall, I like it. It shoots fast and hard, and just feels NICE.
Mostly (if not all) CNC-milled parts
Uses Mini Tamiya connectors
Short battery wires
Firing selector is a bit sticky and resistant to move.