Review on K75575WW: Kensington Ergonomic Vertical Wireless Mouse with Improved SEO by Derek Jha

Purchased to replace a different brand trackball input device. I wanted to avoid the tensions that have caused carpel tunnels to form in the past. This works very well. It takes a day or two to adjust to its height (as I waved my hand across the table I learned to avoid hitting it). But I tried another brand that was only slightly higher and couldn't stop banging on this one - how frustrating it is. This Kensington was no problem at all. Tracks well, very responsive. comfortable to put your hand; buttons work fine. Great wireless capability with included pluggable USB receiver. (Bluetooth connection not tried.) Wakes up quickly (after 10 minutes of inactivity). Slightly late awakening for the first time after a long night at the computer. But I can live with waiting 3-4 seconds once a day if that means the carpel tunnel symptoms don't come back. [UPDATE: After replacing the battery (although it worked fine) the wake up time is MUCH faster. In the future, an increasingly delayed wake-up time will only be a sign that a battery change is imminent! Glad to know about it.] Very happy with the design, performance and price.