I really hate that every peripheral that Apple makes nowadays (keyboards and mice, etc) are going wireless with no option of a cable. For a desktop, two wires are not going to increase clutter. But having to buy 4 AA batteries every 2 months is a pain and they're pretty expensive. Not to mention how it's very bad for the environment, so much for "green"! I understand that my phone should be wireless, and that my notebook's mouse should not have a wire either. But desktop peripherals? Why? Having to worry about turning your mouse off, and using it too much, etc... just adds annoyance.
The only time I would accept wireless mice is when the battery would last at least a year with normal usage. My Logitech mouse lasts a year on batteries but the power saving functions add a bit of lag to the cursor movement, a compromise that isn't worth it for me. What happened to precise mice? Back in the days of ball mice, precision was a given and your cursor moved at exactly the same moment your hand did.