The strap goes on pretty easy with velcro. It had a small little pouch cushion that goes directly under your knee. As I said before, I don't know if this attributed to my pain-free run, but I'm sure it might have helped. It didn't slide up and down during my run and was easily adjustable. Time will well if it really helps my knee on those long runs!
Today, I have scheduled a 5 miler on the treadmill. It is supposed to rain and it is kind of chilly here today (plus I need the gym time for my insurance rebate!).