I haven't been on this forum in a long time but haven't really posted or been here very often lately.......I've been happily vaping along for a long time, using different mods over the years and I LOVE the dual coil tank triple punched carto's.....they are my fav......I've used the bolt mod, and the zmax (which is now 8 mos old) and now finally I just got a vamo v2 in the mail because my z max has been acting funky. It was on sale and it looked nice and user friendly, but dear God, it's a terribly weak vape. I'm using 18650 batteries and at 3.7 volts on the z max I'm getting loads of vapor and great hit and that strong sizzle sound when you fire the atty, but on the vamo, it's like a very weak sizzle sound almost like your battery is on it's last leg and you have to hold the button down a LONG time to get a decent hit.....I tried upping the voltage and that did nothing, changing batteries, carto, etc.....sometimes it doesn't fire at all or there's a long delay after you try to fire holding the button down and then like 5 seconds later you hear the atty sizzling.....I love the way the stainless vamo v2 looks and I know there are newer versions, but I'm sending it back.......