Helix Blue Pack

I have used the cheap TENS Unit in the past and thought they were the best. I bought the Helix blue and it is far superior to anything I've used before. If there is one thing to improve upon is the wires, they are stiff and can be twisted and tangled easily. Every couple of uses I straighten them out, it's not a show stopper but after an awesome session I don't want to be messing with them.