I've had a limited amount of mods since I started vaping in late '08, but one thing I know is that I can't stand bottom fire or thumb index finger buttons. You can't stealth vape with a bottom firing mod even if it is the size of a toothpick comfortably. It's all about that pinky fire, or palm squeeze. I can understand why Imeo get's mad when the knock off artists copy that design. A GGTB stealth vapes better than a comparable bottom firing 18350 mini mod.