Logitech M505 Wireless Laser Mouse
Extended battery life: Batteries can last up to 15 months, among the longest in the industry. Laser tracking: Delivers smooth, responsive, precise cursor control, even on polished or wood-grain tables...
Pros: Light for a battery powered mouse. Responsive. Good ergonomics. Looks good.
Cons: The batteries add a little weight, but that's about it.