Good addition to exercise equipment.
I use this every day.  Great for stretching hamstring....leaving heel on floor gives me a better stretch rather than hanging off a step. Stays in place. Easy to use. Is firm, but not too firm.  Bumps help with keeping your foot on the roller.  I would have preferred it not be quite so high...but once I figured out where to put my foot, it works well.
Rating: 5 stars