(The dirt and grime on the white mouse in the picture are pencil marks and modelling clay because I was sculpting a few ideas for a mod recently)
Logitech Pilot Mouse. Not the "Logitech Pilot Mouse Optical" or "Logitech Pilot Wheel Mouse".
PS/2, optomechanical. The retail version is white with either multicoloured or (later) black Logitech logo on the top. A granite version was shipped with SGI machines, and looks almost exactly like the other "SGI Granite" mouse that wfaulk posted, except that this mouse is just a little bit more narrow in the back.
I would be using one now if my PS/2-USB adapter did not reset so often. I have been buying replacement after replacement of PilotMice only because I couldn't find a proper USB/optical mouse with three buttons on top.
I think that I have used the
DECstation mouse once... but I think that one must have been faulty because it did not track very well. This was way back before the iMac puck.
One thing that I do not like with the
Evoluent is that the scrollwheel is the middle button, and what looks like the middle button on the outside is actually the
right (menu) button.
If your not aware majority of mice have kept the 3rd button under the scroll wheel.
I think that every middle-mouse button user is very aware of this. The problem is that using the scrollwheel-button feels very awkward and it is difficult to press the button without turning the wheel a notch.
The middle mouse button is most useful under Linux/Unix where there is a long history of using it. In practically all programs, both old and new, it can be used to paste the "Current Selection" at the point that you click. Nine times out of ten when you press a scrollwheel, you will turn it unwillingly, thus scrolling the text in the window, making you miss your mark and paste the text at the wrong point.
Note that the wheel is often located higher up on the mouse than the left and right buttons -- even though it is intended to be used with the
longest finger on the hand.
I have started to get pain in my hand from having used the scrollwheel too much with my middle finger.
Thus, from an ergonomic perspective, the scrollwheel design, on top of the mouse is just horrible. I find the thumbwheel on the
Contour Mouse or the two thumb-buttons on the
OrthoMouse to be better alternatives.