[Felix The Assassin]

Lag! It's all about the lag.
If I may, let's break it down.

Hard wire mouse. Think current, positive (X-axis) and negative (Y-axis) flowing at the same time, at the same rate, and always on. Just a slight twitch of a finger can cause the on screen cursor to move. But what did it take for that cursor to move? Signal from last position is always active, and a transfer rate of about 1000 reads a second to record movement.

Wireless mouse. Think switchable current (light switch). Not always on, must receive user input prior to current flow (always -standby (battery life)). As well, most high-end wireless mice only achieve a paltry 500 reads a second (through design this is only half the rate of transfer as it's wired sibling). In addition, they must have an internal power supply to send signal. All of this equals = lag to the user. In a work environment or low frame rate gaming session, it is negligible. However, placing a great demand on the mouse in a fast frame rate game will result in a plethora of bad things, not limited to, said mouse being thrown across the room!

There is yet hope thou. However, I do not champion the company for anything, credit is due. I recall reading a recent article about that company from Redmond, introducing a superior quality mouse for the gaming community. IIRC, it was an X8 sidewinder, or something similar. It might be worth looking into.