I have been using the RollerMouse Pro for over 12 years and absolutely love it! It was recommended by an occupational therapist due to my carpal tunnel syndrome. I work on a desktop PC all day and wouldn't want to be without my RollerMouse. My Pro was still mechanically functioning, but the fabric on the wrist rests was finally giving way from so much use. I decided to finally upgrade to the RollerMouse Pro2 after finding a great deal on eBay. I just received it today and love the updated tray design and leather-like wrist rests. The buttons and Rollerbar are the same as the Pro. Initially switching to a RollerMouse may take some getting used to, but put your traditional mouse away and it won't take long. Yes, the RollerMouse is expensive, but is worth the expense, especially considering I had my Pro for over 12 yrs and I could have kept going with it! You will give your wrists, arms, shoulders, and neck a break by using the RollerMouse Pro.