P.S. I have a Coolfire 4 (with internal battery) that I have been using everyday for 2 years.When/if the battery finally dies I will definitely replace it because I love it.
I love the Coolfire IV, too! Bought just 1 initially, then bought 3 more about 8 months ago for $25 each. Since I've sold and/or gifted 2 of those to other people (and they're now getting harder to find at a decent price)...I bought 3 more on Heaven Gifts in the last month. Those are in my own stash now!
As far as the JoyeTech eVic VTC Mini Kits - Got 3 that came with the eGo ONE Mega tanks from Health Cabin in October for $13 and change. Then got a bunch more later that month from Heaven Gifts (that came with Tron-S tanks instead)...for an extremely low unbelieveable price per kit!
Since I help friends, family, neighbors, and others who are interested in switching to vaping from smoking...when I find really good deals on mods, tanks, or kits...I buy multiples of them. They then pay exactly what I paid for whatever they choose, instead of having to pay the local vape shop prices. I tell all of them who successfully switch, that I'll gladly be a "deal finder" for them for any mods, tanks, coils, etc. they'll need. Doing it to hopefully help others switch and stay with vaping...instead of going back to smoking. I'm teaching 2 neighbors who've totally switched in the last year, how to DIY their eliquids in the next 2 weeks, too!
