This is deliciously vicious! My wife and I took turns running it over every inch of our bodies for a good couple of hours. WOW! We have never known sensations like this. The pins are good enough on their own, but with the power on (Series 1 box) the effect is truly mind blowing. Being bipolar means it can be used anywhere, which pleased my wife as she loves nipple play. When she ran it up and down my cock, and back and forth across the head, well I didn't think such feelings were possible!
The tool itself is very well made, and feels heavy duty. Beware, those pins are very sharp! And blood was accidentally drawn. If you are looking for new, very intense sensations, buy one of these!