I still use them on the VVs. 3.7 volt mod is fine, but its nice to crank them up a bit. That one day, I was cranking them up to over 7 volts, haha. Its nice to be able to crank them all over the place, verses having to have a PV to dial them in to that sweet spot. I have so many attys laying around, because I absolutely HAD to have 2.0 ohm attys for my non VV mods. Only VV would let me vape a 1.7 or a 2.2 and be happy. I try to crank up an atty and all i get is a mouth full of burnt tire taste. I just want a warmer/harder TH but you can't with a regular carto or atty. Dual coils you can crank up to hit like a truck, or crank down to that sweet mellow mega vapor cig type drag.