Not sure why so many have troubles with Wireless. I use to use a Wireless Keyboard mouse set from Logitech, till I "broke" the mouse against a wall in anger, and keyboard became friends with a soda. I now use a Wired Keyboard (Media center Logitech), but wireless mouse (LX6 Optical Logitech) and have no troubles at all. Batteries last about 3 months, and there is no jumping from interference/dieing batteries, I personally can't stand Wired mice due to the cord always catching on things, and causing restricted movement.
Also, with Logitech they have Battery warnings to make sure you know they are close to dieing. Even without the software, some Mice have little lights on them that flash Red.
Then again I have always been picky.
