--that I've used in various locations on my body--I originally got it to help with the variable meralgia parasthetica symptoms that I have in my right thigh.

I find that it helps considerably while it is active; the sensations generated are not unpleasant and they do block pain. The pain tends to come back fairly quickly once I shut it off, though.

One other thing I have noticed--if I have a bad spot and I leave it on for many, many hours over consecutive days, sometimes the pain lessens or shifts or seems to have a different quality. I know others have reported this before, theorizing that constant application of current over a considerable length of time alters the firing pattern of the nerves. How true this is I'm not sure, but since TENS is safe and non-invasive, and the only thing it costs me is recharging the batteries, I will certainly keep using it, and recommend anyone to give it a try (like most of these PN "treatments", it seems to work well for some and not for others).