I don't like the fact that the
dna doesn't have a buck circuit. It can't lower voltage below what the battery voltage is.
I love my kayfun and ProVari. I don't understand the 'on the run' comment the OP made regarding Kayfuns.
The Kayfun is specifically designed to provide near dripping flavor with the portability of a carto tank or clearomizer. My coils last over a month with minimal maintenance. I keep my ProVari in my pocket all the time. No leaks at all from my Kayfun.