I ran it @9 volts for some 9liner and then a 5 liner, both tatsoul bugpins. It laid really nice lines for sure. Definitely louder than expected(sounds like a coil) and weighs more(181grams!) but I can't complain about the performance. It's really adjustable, although the adjustment design leaves something to be desired, as it's not super user friendly on the fly. It does have a ton of versatility though as you can tune in any stroke length or power hit you want and both independent of the speed. It can run super slow like 50hz with a hard hit or 125hz and soft or vise versa or anything in between.