My previous mouse recently stopped working so I went shopping for a decent, responsive mouse to replace it.
For reference of hand size, I can grip a basketball in one hand, not strongly but enough to pick it up.
While this is a fast, responsive mouse, and the buttons are all working fine, the form factor on the right side just doesn't feel right. The left side where the thumb is, the mouse has a non-slip, textured rubber finish, and curves outward, so it's very easy for you to get a grip on it with your thumb. The right side, however, is smooth and vertical at the top and flares outward at the bottom. That means the pinky finger is trying to grip a smooth plastic surface that angles the wrong way to the direction you need whenever you need to lift the mouse to adjust its position. If it had a rubber surface, or if the right side contours angles outward on the top, that would make it so much easier to grip and lift, as it stands it feels very awkward whenever I try to lift the mouse slightly to adjust.
This is one of those times I wish Amazon have better pictures from all angles.