This mod is a beast! Ive only had it for about a week but i beleive it is the best mod i have ever used. With the ability to change from temp. Comtrol(F or Celcius) to tcr120 m1(not sure what that mode is for yet) to power(wattage) you can adjust almost anything. With a counter that changes from puffs to time to amps. This mod can tell you anything you want to know. Then you can plug it up to a computer to update the firmware( w/software downloaded from the wismec website) and change the logo to almost anything from the symbol for xbox to an ak47 assault riffle, even butterflys and your astrological signs. (You have to find the good ones on youtube). Holding three 18650's the battery can last all day and into the night unless your passing it around at a party. The only downside i've found is trying to charge it with a usb cable insted of charging the batteries in a charger outside of the mod. It gets pretty warm but with two one and a half inch vents one on each side) i dont think it would be dangerous to charge it with a usb cable as long as you let it set out on a table or dresser where it will have good air flow around it. But with a price tag of 50 bucks i dont think you can beet this mod. Over all i give it a solid 9 out of 10.