After just three days, I have radically increased the flexibility in my calves and hamstrings, and hip flexors. The device looks so simple that it seems odd to cost what it does, but perhaps that is because so much research and development went into its creation. In terms of value, yes, it is worth it. When I bought it I was in a lot of stressful pain. Not so much pain now, and I am using the device before and after my running, which is great, since I previously had experienced some cramping ...