I purchased a TENS machine recently having read on various forums of others' success with it for RLS.
The first night i went very gently, using it at 1/5th of the recommended intensity for approximately 10 minutes.
The second night, i upped the intensity to 1/3 of the recommended amount. I also used the device for 30 minutes.
That second night, i noticed quite a few muscle contractions as i was using the device but figured that things would calm down eventually. The bad news is that they didn't. I had the worst RLS that i have had for a long time and as a result, I'm not especially inclined to try it again.
Back to the drawing board...next on the list is an infrared lamp 😊