I bought this mod a couple of months ago (Gearbest $21) and have been using it almost exclusively since. it's a great little device. It fits perfectly in the palm of my hand. I has more than enough power to satisfy my needs. I screw on a tank with a TC coil and it switches over automatically asking me Ni/Ti and then old/new. I screw on a tank with a regular coil and it switches back to V/W automatically. The only shortcoming is that it's a bit fussy on which charging cable I can use. I've found a few that work well with it. Also it doesn't have pass through while charging. If you want to charge while using the mod you need to take the battery out and charge it outside and drop in another battery. None of that's a big deal though. I like it. This is my first adjustable mod. I might get another in a while, maybe something bigger like a Wismec DNA200. Any suggestions on something new and outstanding under $125 USD?