Do you suffer from hand and arm pain while mousing? Many factors can be blamed, from poor posture to a badly designed ergonomic environment. Unfortunately, simply adjusting one's seat or desk height doesn't always solve the problem (and sometimes you can't adjust either of these much at all).
I was a longtime sufferer of the condition I dubbed "mouse arm," which at one point got so bad that after a few hours, I would have to awkwardly mouse with my left hand for the rest of the day. About five years ago (long before I joined CNET), I discovered a company called Gyration and its line of gyroscopic mice.
The very latest version is the just-reviewed
Unfortunately, the new Gyration Air doesn't compare favorably with either the Go or another favorite,
A final note--newcomers to the gyroscope party should note that using one of these devices seems impossible at first, but after a short but intense 24-48 hour learning curve, it'll be second nature.
Also, see our handy chart comparing gyroscopic mice.