I've seen [[https://lloydspharmacy.com/products/omron-heattens-pain-reliever?source=aw&awc=2453_1605867185_ea952a1b703b03949248460a8a0e2875&utm_source=Skimlinks&utm_medium=affiliates&utm_campaign=lloydspharmacy this machine]] advertised for Black Friday and it's a good deal. But do these things work? All opinions welcome - I have awful neck, shoulder and back pain from wfh and general life stress.