TrustedReview posted a review of the Logitech MX518 - Gaming Mouse

There are a number of reasons why I love the MX518, not least of which is its size. Not only do I have small hands as I already mentioned, but I also use a mouse very differently to most people. Whereas the majority of mouse users will hold the device in their hand and move it around from the shoulder, I rest the heel of my hand on the desktop and move the mouse with my thumb and ring finger. Using the mouse in this way means that it has to be small enough to move freely under my hand, while the sensitivity also has to be high as the range of movement is limited.

Logitech MX518 - Gaming Mouse