Three years later and I still use mine. some nights I just put it on and lay there in extacy, but never com. Next night, big squirt of jizz. I have three differnt boxes now. fun to experiment.
The sensation is one of a buzzing, tickling feeling as the current rides up and down your cock, with a long tingle at the head. You can feel the cum progressing up your cock. Rather like a hands off blow job, only more intense. Well worth it to purchase one. google it.