Tens is different, just pain relief while Scenar is stimulating correction and healing at the same time. Remember when Layne Beachley broke her back/neck and was told she would never walk, let alone surf, again? Scenar... pain relief wouldn't have got her to her next World Championship...
Try this one too:
Customer Testimonials Scenar Health Pty Ltd - Pain treatment and pain management device: Handheld Scenar Medical Device
Which is just the testimonials section on the same page.
Scenar was devloped originally for the Russian Space Program. They needed something non-invasive and portable, that could basically be used to treat anything - from infection to injury.