I have spent a couple grand on various rebuildables , a provari, a vamo egos and ego twists. I was searching for the best vape , easily portable no hassle..... tanks cartos dripping attys just about everything. Then I get a reo copper vein mini and........ I found my perfect vape. I am VERY satisfied with this product.. Now you may wonder what the problem is?? I have nothing to chase anymore, so really this is the greatest endorsement for the reo. Now I build 10 to 15 coils at a time, charge one battery a day and all is well. Kinda took the hobby part out for me, but the important thing is I have not smoked in 8 months!!!