Works for me
Been running for over a year.  Occasionally have some pain in one knee or the other.  This brace really helps.  I purchased my first one a couple of months ago.  I just purchased a second one, in case I need to wear one on both knees at the same time (although this has not happened yet).  I went with a size smaller than their measuring system would have called for because I wanted it to be tight.  It has stayed in place for me, even during 10K runs.
Rating: 5 stars