The Snow Wolf is VERY hit and miss. Some will be fine, others die within a few months, others develop auto-fire issues. They're also not a true 200w device. Dual 18650s are not capable of supplying the power for 200w to a regulated board, it PWMs after 150w. This means it's an average of the time of pulses that gives you the power after 150w. Personally, I'd go for a Sigelei 150w TC and be done with it, or if you want a 200w mod, get a DNA200...