As I return your JAS knee device, I want to provide a huge thank you and sincere testimonial. My use of the JAS device made a significant difference in my left knee replacement surgery recuperation. The device is of superb design and construction, easy to use, and my customer service representative Kent Devall was helpful, cooperative, understanding and represented JAS in an outstanding manner. In the future, I may need to have my right knee replaced and if so, I hope to be able to use a JAS knee device again.