I've been using them solidly for over a week now and they have performed flawlessly for me. I put in a fresh coil and wick into each one every day, so thats over 14 builds. And I've not had a single gurgle, leak or dry hit, just perfect draws every time.
So easy to build, and the threading seems really smooth too, never had any issues at all with that.
If anything I wish there were a resting place for the coil jig when you clamp the tails. But there is a nice lip to keep the coil legs trapped so not a massive deal.