Got my first of two of these stems from Chainlove and the only regret I have is that I didn't pick up two at the time. The one from Chainlove was 50mm and I had to settle for a 65mm from Hucknroll. Still completely satisfied with both stems and they're well worth the money. So far strong, precise, and trouble free.
I've heard that people have had trouble with the bolts slipping, but I used a torque wrench to make sure the values were correct and have yet to have a problem.
Bottom line: Awesome stem for an awesome price. Grab one while you can!