I personally bought, back in 2001, an under the desk slide out keyboard drawer, the original Microsoft Natural full size keyboard, and the Microsoft Trackball Explorer trackball. I have since worked for three companies spanning seven office/cubical moves. I also have a similar setup at home. I can't live without it! In my opinion it is much more efficient and comfortable than placing a keyboard up on your desk, making you sit 1 to 2 feet from your monitor(s) and having to move your mouse all around, constantly falling off the mouse pad or hitting a seam in the desk or some other item, or having to pick the mouse up and bring it back to you because you've extended your arm all the way but you're still scrolling or dragging a window.