Oops!  Sorry, how did I manage to repost Nenah's.  Anyway, the Scenar device 
was given a test in Australia by one of the Universities and was demonstrated 
to be effective.  

A Macquarie University randomised control trial using ENAR versus conventional 
TENS has been conducted in Sydney and this showed 'dramatic and sustained 
results' with chronic pain reduction, functional improvements and general 
health restoration.  http://www.enar.com.au/

And I know of at least one doctor over here in the West (of Oz) who bought it 
to use on a particular problem which nothing else would fix (wish I could 
remember now what it was). 
Rowena