That is interesting. I too, bought mine from Ultra Mist, and its been going great for a month now. Yes, the tank is a little thin, but I've been careful when threading it back on. It has a tendency to lean sometimes as its going together and found if I put a little pressure on it, (prior to threading), it would snap into place and then start threading together. I can see if you put a death grip on it, that it would possible break, but like a lot of things in
vaping I've found you have to be patient and handle them a little easier... I had a problem with the original o-ring on mine and once I changed it out it has went together easier. As to my experiences with UM, they have been a great vendor to deal with...