I've heard they are really good for those with depression, anxiety, autism, chronic pain, insomnia etc and wanted to try some for a while, but the pricetag put me off in case they didn't work!
I've just managed to get some from The Works which are grey 1m x 1.5m and 4.5kg for £20 each. I'm testing them on each of my kids, my husband and myself and I'll report back, but at £20 it seemed too good an opportunity to miss! Click Here to take you to them