I use them as well. As MrsD stated, they work best for spinal stuff if they're placed over where the exiting spinal nerve root is. I also use up to 3 at a time, cut in half and placed pretty much running parallel to my spine, though sometimes I also use them for intercostal nerve pain.

They're a handy tool to have around at times, because the spasms I have often don't respond, even to escalating doses of pain meds and antispasmodics.

Theresa