Summary: Great product. After approx. 10 years of use it's still going strong & I honestly expected this thing to fail by now.
Pros: This is probably the best mouse I've ever owned. About 10 years of ownership and still going strong. It has probably outlasted the amount of time that it has been designed to survive, because some of the rubberized finish has rubbed off and a few of the sliding pads have perished during the time....
Cons: Some of the rubberized finish & paint on some of the buttons have rubbed off. But that's just wear & tear and expected. I honestly expected this thing to fail by now.
Summary: The MX510 is the best wired mouse I have ever used, but unfortunately it has been discontinued. It has 8 programmable buttons and is Windows and Mac OS X compatible right out of the box. The MX518 is mechanically identical, however you have to purchase a 3rd party program to use it on a Mac.
Summary: Bought this mouse in 2004 and it's still going strong. Only problem is that a few months ago mousewheel upscroll isn't working as well as it used to. I'm going to replace it with the same model soon. mx510 FOR LIFE!