Ok, received my Logitech G5 the other day... it's a great mouse. This mouse is *almost* perfect for me. The only thing that annoyed me is the middle click (when you press the scrollwheel) needs a good hard push - not good if you use tabs in firefox like me. There is a way to sort it though - install the latest Setpoint drivers from logitech and re-assign the left/right scroll on the middle button to act as 'middle button'. This makes it easier, but isn't perfect.