I have one, and another on the way. Haven't had any problems to date, but I only run it at 15w. From what I've read, these have a problem getting rid of the heat of the boards, so even though they say 50w, I wouldn't run them above 25w-30w. I got mine for the battery life, not the power. I'll use a quality box mod with an evolve board for my higher power usage.