Ann, I am not a sales person! Like you, I wanted a hot tub for therapy because I have Lyme disease. I wanted something big enough for my husband and two teenagers to be able to enjoy also.
The tub that worked for us was a Marquis Epic. It is a large tub (seating for 7), but that wasn't the real selling point for us. The Epic has excellent therapy. The lounge has jets that target thighs, calfs and feet and the deep therapy seat has fantastic therapy for back, shoulders, neck and feet. Each seat has different key features. The footwell is large enough to allow water exersize in the tub and if you have problems with joints, that is the best! It took me a long time to convince my husband that a hot tub would make a difference for me.
Not only does he see the difference in how I feel, and what I am now able to do, but he benefits too. We both sleep so much better and seem to have more energy! the hot tub is the best stress relief ever!
Hopefully Cappycat will stop by and comment. She also has an Epic and suffers from Fibromyalgia.
Good luck and be sure to check out the Epic, Boni