Go to www.innovativehs.com and click on ensonix at the bottom. Also check out AquaSonix therapy on the same sight as that is what they are now providing with the enSonix device so you can treat yourself at home. ON the enSonix site look at the clinical results.
sus, i have the same problem too with the cover. my parents have a hottub and it helps with my mom's RA (and mine too - I use it when I visit). My dad takes care of the hot tub, and helps my mom in and out.
The cover would be impossible for my mom to get off alone. You need to be able to get the cover off to enjoy.