I've had mine a few years.

I was interested because I had had acupuncture and a couple of the electrode placements had seemed like they could have helped. It was very difficult to use initially because it would cause my tremor to worsen and then I couldn't sleep. Using it earlier in the day helked a little but the "exercise" generated by too large a pulse would lead to pain. I didn't know what was going on at the time but I was overusing the electrodes and it was actually making the treatment more effective. Recently the thing's been getting a bit of a workout and I try to use it half hour every day. Using it late at night actually helps. It gives me a half hour of something like relief and it might be helping at a more basic level. At the very least I'm no longer doing less and less all the time.