I have a V6 and a V7. They were good starters but don't compared to my istick 50. I compare the V7 and the istick at 40 watts using my Little Boy rda and the coils don't get as hot on the V7. This leads me to believe that the Vamo's circuitry is not accurate and when set to 40 watts I'm not really getting 40 watts but less.