So far, so good ! I'd previously purchased a Boundless unit and it was garbage. Wouldn't charge up or hold a charge, and they wouldn't respond to my emails or calls. But 420 Science ROCKS, and they took GREAT care of me on the deal. After hearing good things about the CFX, I decided to roll the dice and see how it went. As noted, so far, so good. Heats up quickly and holds a good charge for 4 or 5 uses, minimum. Great vape !