I work a lot with the computer: processing photos, book-writing (a publication being in Kindle - not simple -!) And a lot of work in progress. Suddenly, I found myself afflicted mouse syndrome! A classic that can heal through these media, a small anti-inflammatory and muscle to start a little better back-end, there is no "magic" in this area. I made an offer and arms already in use (beneficial), I realize that one too destabilizing for Further keyboard work. Adjustable both laccroche on the ledge in height with a knob. Beautifully follows the movement without interfering. So I bought me a second. No need mouse tray, keyboard shelf in my office (rather fine) already has excellent nice and quiet mouse - click click quickly becomes tedious - a good carpet ... A beautiful Finnish quality, solid and reliable. I can not do without.