0.o That looks like they took the IntelliMouse Explorer (ancient optical mouse), painted it black, swapped the red LED for a laser sensor, and rebranded it. Would kinda explain a lot too since the last comment on that mouse was from '06. U should seriously try this Logitech Performance Mouse MX. Freakin sweet.
Oh, and on another update..... so far i haven't plugged the mouse back in since i performed the last complete charge last Tuesday. Setpoint tells me my battery is low, but i haven't gotten anything saying that the battery life is critical yet like it used to with my MX Revolution... and sadly there isn't any meter in the Setpoint software for the Performance Mouse MX to give a bit of a breakdown as to roughly how long the battery might last. Just says they're low. Still though.... nice to be able to still use the mouse while it's charging unlike the MX Revolution, MX 1000, and i think just about every other wireless Logitech mouse.