I bought one a couple of years ago when I started having terrible pain in my feet, always worse in bed. Probably diabetic related.
Every time we saw the tv advert DH told me to buy one to see if it helped, but the price put me off.
Anyway, I eventually caved in and bought it and what an absolute life saver it's been. Pain relief was almost instant.
In my case, it's been well worth the money.
I no longer use it every day, but it sits under the couch ready for action and I usually pull it out 2-3 times a week. I do like the feeling of it. 