Here's the *newer* version of the exact same mouse.
Microsoft Wireless 5000 It's a newer product model, but it's the exact same mouse. It should say something about the quality of the product that it's been around for 4 years and is still considered a standard in the wireless mouse lineup. As a matter of fact, the worst thing anyone has to say about it is that it's slightly TOO big for some people and they have trouble reaching the side buttons. You really can't find a bad review on this mouse anywhere. Honestly, go check one out, you won't be disappointed.