On my first one, the threads of the tube broke off into the crown. I was able to use friction to keep it together for a few weeks, but ultimately ended up sending it back to Angus at Puretime who was great and had a replacement unit back to me within a month. The new one is perfect and has had no issues.
On the finish -- it is pretty tough. However, it is still an applied coating, much like a DLC or PVD. So it will scuff or chip if it comes in contact with metal, stone, or something else hard. I have a small scuff on the bezel from being drunk and an idiot, but other than that, its pretty good. BTW, I have the Noob version, not the H-maker.