I was nervous to purchase this not knowing if it was legit or not, but it totally was and it downloaded quickly after I bought it. It has been working perfectly for 3 months now!

I have used for almost a month. Although I am exercising and doing leg strengthing exercises for my knees. I do see an improvement. Don't know if it is the arthri D3 or the exercises

It looks bigger online than it really is. The book is about the size of a 5x8 photo. My son likes it, but it is a little cheesy for my taste. Quarters have to be pounded into some holes. Has enough holes for all the years though.