It works and not too hard to get used to.
Overall this product does the trick - no more pain when I first stand up in the morning. I was surprised at how easy it was to get used to wearing overnight, just make sure the straps aren't too tight or you will wake up! I purchased a large as I was concerned about the diameter for large calves after reading some reviews. I wear a ladies size 8-1/2 and I believe the medium would have allowed for larger calves based on how the straps are constructed.