Purchased 3 wrist support mouse pads and we have used them for about 1 month now.  One of he wrist support sags terribly in the center of the support creating two distinct ridges which are uncomfortable.  The pad is supposed to conform to the wrist for maximum comfort.  It appears to lack sufficient gel in the pad to maintain its shape properly.  Another pad has a noticeably air bubble.  I would consider another brand.