Have to agree w/ what sticks and ghostvapor said. The HI is giving me incredibly consistent performance. It's absolutely incredible how little effort is required to get an enormous cloud out of a half-full turbo tube bowl. Just a couple seconds of comfortable, natural drawing is all you need for a ridiculously dense, big cloud. Stretch that draw to 4 or 5 seconds and your lungs are going to have a seriously hard time taking it for more than a few seconds without water filtration; you'll brown the whole load in one hit. It's faster than smoking a bowl for fuck's sake, it actually feels weird to get so much vapor with such a short draw. I also have to agree with Gonzo, the PD power supply is giving me the perfect temperature. Alan sent me a replacement VV and non-VV. I forgot to check the mail today, it's probably in there. Just passing it back and forth between 2 people, I don't notice any drop in heat from hit to hit whatsoever. I have a feeling it would hold up fine in a group setting, but haven't gotten the chance to try it. Honestly, the hits are such that you're not going to want a "second helping" immediately after anyhow if you're going direct draw.