I'm using the IPV 2S 60w which was about 120.00 in the brick and mortar shop here in town..
You might be able to find it cheaper online.
It's also software upgradable to 70w ,75w and they are saying by the end of the year they may have their 80w update out..
I've used everything that i can fit on it and it works really well..
Atlantis sub ohm,kanger sub ohm,Nautilus mini and the regular Nautilus,my Kayfuns and my drippers..
it'll use 0.2ohm coils up to 3.0 ohm coils... so there is a lot of range there..
I used to carry around 4 different mods with me at all times with batteries..
Now i just carry around this mod and the tanks i want to switch out,plus my batteries..
Love the thing...
For me and what all it offers with upgrading it to higher watts if i choose..it was well worth the money and felt like a good bang for the bucks..