I bought one of these from Amazon about three weeks ago for a back issue. £25 including postage.
Well I been using it for about 10-15 mins every night and has helped my back but also I been noticing my bloat and tummy has decreased, my bowels are working overtime and digestion is better. I do feel a bit of weight loss too.
I looked up benefits of using these mats and they are incredible. I would highly recommend buying for such a small investment and see if you get same results.