Using a gyroscopic mouse is a lot like driving a stick shift. It's like second nature to those who do, while everyone else is either scared away or has a steep learning curve ahead of them. That said, we've been using gyroscopic mice regularly for more than five years, and anyone with persistent hand and arm pain caused by poor ergonomics or repetitive motion will likely find some relief with a device like the $99 Gyration Air Mouse, which is held in the hand like a remote control--a much more natural position for the wrist. The genius part is that most gyroscopic mice automatically switch over to regular optical mouse mode when you place them on a flat surface.
Gyration's standard mouse, the Gyration Go, has been a favorite (and remained largely unchanged) for years. This new version is a travel mouse take on it, squeezing down to about two-thirds the size of the Gyration Go.