Summary: I have use old mouse for several years. PERFORMANCE IS GREAT. When I bought second computer I again purchased this mouse because of its reliability. Also this mouse work on almost all surfaces. You definitely could not find better mouse for lower price.
Pros: Very responsive for an affordable price. Takes one AA battery to use and has a nice spot to hold the USB dongle inside the battery compartment to not risk losing it. Both mouse buttons and the scroll wheel are responsive and the mouse itself moves the courser fluently. A nice design that stands up to Logitech quality.
Cons: None really, I've seen some people who keep complaining about DOA but there's nothing wrong with the mouse's design.