It looked like the same form factor like my beloved MS Intellimouse (which is dying). Plus it has 5 buttons so I can macro some things to it in World of Warcraft. It is optical as well. Also it cost ...
Does an optical mouse lose its benefits if it is plugged into the PS2 port instead of USB? I have some vague memory that the ps2 port can only handle enough data for like 400 dpi or whatever the term ...