Works great! Just make sure you measure and buy the right size. And more importantly, buy them at Bed Bath and Beyond or Walgreens because the online ordering is confusing and they nail you on the shipping.
But as for the product, I have been wearing the knee sleeve for a few days now and my knee feels much better than before. I am looking forward to trying the elbow sleeve at bowling to see if that will help with my arm fatigue but just wearing it alone already feels better supported and the compression works for me.
One grip is that the knee sleeve tends to roll sometimes and you have to adjust it but overall so far a good product. We shall see over time how much they retain their tightness once they stretch for a few weeks, months, and beyond.
Bottom Line: Yes, I would recommend this to a friend