When they are working they are good. Negatives would be that they need to be tilted on side when charging and they use a lot of vape liquid. I have had many issues with coils. Purchased a whole new tank and 1st coil was hazardous popping and sizling and glowing orange and also happens to another brand new tank despite following all instructions. Also there are no instructions or mention where to put rings when purchasing tank. They come with them supplied but nothing that even mentions them.
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