When comparing Kensington Expert Mouse vs Logitech MX518, the Slant community recommends Logitech MX518 for most people. In the question“What is the best gaming mouse?” Logitech MX518 is ranked 11th while Kensington Expert Mouse is ranked 55th. The most important reason people chose Logitech MX518 is:
There is a built in application switching button that behaves the same as alt+tab.
Specs
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Pros
Pro Comfortable and ergonomic
With thumb and pinky on the buttons and three fingers controlling the ball, the user's wrist lays flat on the table (or on the provided attachable wrist rest).
Pro Intuitive link between ball motion and FPS camera angle
The ball is large enough for turning it to feel like physically rotating an object.
Pro Application switching button
There is a built in application switching button that behaves the same as alt+tab.
Pro On the fly sensitivity switching
There are two buttons above and below the scroll wheel that allow for on the fly sensitivity switching.
Cons
Con Not a mouse
This is a trackball, not a mouse.
Con Questionable secondary button defaults
The upper left button, which is the hardest to use, is middle click by default. The upper right, which the ring finger naturally rests near, defaults to Back. This can be particularly annoying as the Back button is easy to brush when moving hands between keyboard and mouse.
Con Not produced anymore
Logitech MX518 is an old model, that has since been replaced by G400 in 2011, which in turn was replaced by G400s in 2013.