Z Coil, Sketcher's Shape Ups, and Gravity Defyer

As noted previously I have had a number of back surgeries,but I also take a number of pain meds, although not always helping. Despite the upcoming Spinal Cord Stimulator procedure that I am going to have, I was wondering if anyone would be interested in sharing their views on the items listed in the title. I know there are many others out there that have similar experiences, and personally I am always seeking alternative ways to find relief. I tried the Z Coil, and for those of you who haven't they are expensive,but got no relief, in fact found them rather uncomfortable. I continue to wear a man's shoe variation to the Shape Ups, and although they don't hurt me, I am not sure if they are doing any good; so why do I continue to wear them-honestly not sure. Now I found a sneaker called the Gravity Defyer, says; defy pain, defy aging, defy fatigue(defy my wallet of $129.95). Does anyone know anything about them?
Trimstep White Rylin Fitness Shoe - 6