Simply put- when users try this mouse, they love it. We have sold this mouse for years, and no other ergonomic mouse or input device has had nearly the positive consumer reaction this mouse has had. Over half of our staff uses this mouse for four main reasons: it is easy to use, feels good in your hand, works well, and helps reduce fatigue and pain in the wrist and hand. When a customer calls and asks for an ergonomic mouse they can try, I show them the Evoluent. We often recommend the Evoluent mouse in combination with the pronation-reducing Goldtouch or Kinesis keyboards as an excellent ergonomic keyboard and mouse combination.