Summary: i went from a ball mouse to this bad boy!! best mouse ever created!! the first one i got i used until id not only worn through the paint where your thumb sits on the side of the mouse, but i wore the feet out and part of the plastic on the bottom i used it that much!! i moved to the mx518 which is also good, but for me the 500 will forever be the best mouse ever made!
Summary: I've had this mouse for 6 years and it simply does not stop. I really can't emphasize this enough; I've worn through the silver coating and the surfaces where I grip it have changed from matte to a really high gloss. I use it heavily for both gaming and general applications and it has always been reliable and accurate (as far as 800dpi goes). The form, button locations and lift-off distance are all near perfect.
Summary: I've had my MX500 for about 4 years now and I've never regretted the purchase. The mouse is very precise, fast, and the ergonomic design makes it a pleasure to use. It comes with software that makes it intuitive to use, right out of the box. The Mouse Control Panel lets you customize any of the buttons to whatever you want. The scroll button on the top is great when you're weeding through a long web page and don't want to bother with the scroll bars.
Summary: I've had this mouse for quite a while now and miss it when I have to use a different computer. At first, the mouse felt a bit heavy, but now it just feels solid. The movement is precise, the buttons are all in just the right spot. One thing that I'm impressed with though it how well the wheel works. In a lot of mice, the wheel just feels sloppy. Not this mouse.