On my early 2008 2008 MPB, after having great experience installing ML and testing it out with fusion etc, my Logitech mouse went ape-****, then just stopped working if the MBP was attached to my external monitor. I rebooted several times and EVERY time this occurred. I then, added my other computer's Apple mouse and.....no issues what so ever.
Just letting you know.
Just letting you know.