I just wanted to say that I purchased this about 20 years ago and it really helped with my lower k problems as I was played professional spirt back then. After using it for a couple of years I loaned it to a fried to help him with his back problems and he’s had it for over 15 years. My back has stared playing up again and I received the unit back last week to start using again then your post popped up in my Facebook feed. I’ve not seen this advertised in all that time and now within a week of getting mine back I can see that the original unit is still being sold. A simple but great piece of equipment. Well done.