I'm skeptical of ANY wrist stretch procedure, because of the special anatomical nature of the wrist. All the soft structures that can become inflamed pass through the 8-bone tube called the carpal tunnel. Excessive stretches squeeze these structures against each other in this tube quite alot. It's why people who do relatively trivial wrist movements regularly often develop carpal tunnel syndromes. Also, stretching structures you use constantly is of dubious value. You're moving your wrist around from the moment you get out of bed (even sooner, in Fedace's case) so it's a structure that isn't likely to be very tight.