The only down side I have found for myself so far is waiting for my vape pen to charge. I refuse to smoke because I don't want to pick back up that habit. For me just one would turn into 'well... it's only two... three won't hurt... so on, so on...' I guess my question is, what are some budget friendly back ups. Is e-bay to be trusted, because I've seen some good prices for whole kits on there. Thanks so much you guys for any help.