It stays in place (no slipping) and gives good support. I do not feel the same pain ...
I was experiencing knee pain after karate sessions and was worried about damage.  The brace felt very strange when I put it on but I actually found I forget about it mostly when doing things.  It stays in place (no slipping) and gives good support.  I do not feel the same pain after sessions with it on.  It is a little hot and my leg sweats under it but that is to be expected with a brace like this.  I waited about three months before posting a review because I wanted to see if the Velcro started to pull the fabric apart.  So far it doesn't show any wear there.  I'm happy with it and would recommend it based on my experience.
Rating: 5 stars