I got into estim this year, and it's a kick. I had tried stimming from a stereo several years ago, without success, except for getting a shock! This year I bought a fairly inexpensive TENS unit (the Intensity 5000 Hybrid--about $40) that does all I want it to do. It has 5 programmed modes, and I like 3 of them.
Otherwise it is not programmable, as most of the more expensive units are. If you haven't tried stimming, I would go with a less expensive one at first. You can spend hundreds of $$ on the best equipment.
It's hard to describe what it feels like, but it is not electrical or shocky. It uses low current to stimulate the nerves, and depending on the intensity you set, it can be anywhere from a mild tingling to almost a pounding sensation. The larger the surface contact of the electrodes, the higher intensity you can enjoy. I do not turn it up so high that it is painful, and I can't use my unit at its higher settings. But if you start at a lower setting, you can work it up to a pretty intense session. If I have at least one electrode on my cock, I will cum almost every time, and it is much more intense than a hand job. In fact, as I feel the orgasm start to build, I sometimes turn the unit down a little so the orgasm won't be quite as intense.
I hope this answer helps a little. There is a great website (
www.smartstim.com) with a lot of great information and advice. If you have more questions, write me at
tom8310@yahoo.com.