Not used it on my wrist but I've had pretty decent results on shoulder, elbow, knees, shin and hip flexor pain. Will often use it with DMSO or emu oil for greater penetration.
Guy I used to work with and play tennis with swore by the stuff. I never looked hard for it but after a few matches this year my wrist is killing me again. I've been through PT twice for it and am tired of it hurting. I may go seek this stuff out this week.