Provari is a rock solid VV mod, but I hated that it wouldn't let me use sub 1ohm coils... I like using sub 1 coils (that can be handled by my batteries btw) in order to achieve massive hits out of my Nimbus and Trident RDA's... Genny tanks (which I also love) do not need sub 1 ohm to work well, but my double wick Megatron is usually set slightly lower than a Provari would allow.
Basically, sub1 vaping led me to only want mechs (btw - I have a multimeter, I understand battery safety, and I ensure that the coils I put on a 18350/490/650 will not overload my AW IMR batts)