i thought at first i'd not like the mvp v2 cuz of it's boxiness....but I bought one and now it's my all day device....it fits in my work shirt pocket, it lasts (well I don't know really....I get nervous and every 2 or 3 days I charge it) a long time, it's a passthrough battery so you can charge and vape at same time....it checks the atty's oHm, it's vv and vw....and

if I was desperate I could use it to charge my iphone
while the ego's are nice to have as backups....you really only need 1

the mvp won't let you down and it can take a beating...
also with
tanks, always try to get glass or metal tanks so that you don't have to worry about tank cracking juices....
if you don't mind buying from china and can wait about a month
FastTech is dirt cheap (the walmart of vaping) just make sure to read review/discussions or ask here before buying something.....the mvp v2 if you haven't already found a place to buy it from
$39.99 mvp v2