Yes, cheaper does not mean as-good-as-quality. But I have given inexpensive kits to a bunch of people (to help save my pocketbook), and most of them have had good luck with the devices to at least get them started. I have had one battery fail (within a week) out of the cheap kits I have bought. They had no problem buying a new battery to continue down the line due to having found out that teh e-cig worked for them. Plus, FastTech does have a good return/replacement policy (how good it really is, I don't know). I have had a few Joye products fail early in their life as well, so paying more doesn't mean you are failure-proof either.
Salky