So far mine is working fine, but at first i was getting some hot back end issues from time to time. So I checked the connection between the body and the back end and something didn't look right. I took a closer look at the top edge of the body and realized there was a piece of flash metal on the end. I ran a knife over it and the sliver came off. I took some sandpaper to the rest of the top of the body to smooth it over, and I haven't had any backend problems since then. I'm going to run the sand paper over the gold contacts and see if it gets even better. Though I don't know if it can get a lot better than it is doing now. Massive pulls on 4.25 through glass are amazing and the abv comes out perfect. At 3 without any water, I get huge clouds for 4 or 5 pulls, tasty thick clouds. So as of right now, I have no complaints other than the slight QA check that seemed to miss the bit of metal leftover from the lathe on the end of the body. When the hopper is working, it really does astound you every time you take a hit.