Trying it out now and it's working perfectly fine. I know none of my Twists are Joyetechs, but I haven't had any qualms with any. In fact, I hear more problems from the joyetech ones then the knockoffs. Only thing with this last one I got, is the "twist" portion is a lot "stiffer" or harder to turn, which isn't exactly a bad thing. It still moves smoothly and seems to be as accurate as any other. The button seems to be a lot more secure too.