I wasted money on an earthing mat and a Revitive leg exerciser
About 4 years ago I bought a plastic mat that you can put your feet on and it is supposed to keep you 'earthed' so that excess electricity in you can leak away. It didn't cost an awful lot - somewhere between £30 and £40 I think. After a couple of minutes with my feet on the mat severe and unbearable RLS kicked in! I contacted the supplier who had no helpful comments. I tried it several times but the result was always very bad.
About 2 years ago I bought a Revitive leg exerciser (advertised frequently on UK T.V.). It cost over £100. This made my RLS far worse. I can get away with 30 mins early in the morning - this does not help RLS but helps aching legs I sometimes get in bed. Any longer and any later in the day brings on my RLS and makes it even worse than usual.
There should be some way of trying out expensive equipment before committing your money!