My experiences with Logitech mice have not really been very good. I've had a Logitech G1 mouse, which was one of the best mice I have ever used. This died within 1.5 years. My experience is opposite: Logitech mice absolutely don't do well in dusty environments. This was replaced by an MX518 (older 1600 DPI version) which also failed in 2 years. I replaced it with a DeathAdder 3.5G which, though working well, had a lot of firmware bugs initially (most likely fixed now).
I can say with some confidence that the DeathAdder 3.5G is a better mouse, glides smoother and has much better precision on even ordinary mousepads compared to the MX518. However, I didn't want to put up with the firmware bugs I had and hence gave it to a friend.
Now I'm using a Microsoft Sidewinder X5 and it's been going extremely strong with no bugs whatsoever. It's only 2000DPI but it suits my purposes. And it's built like a tank. In fact, My Microsoft mouse and keyboard have outlasted any Logitech or Razer devices I've ever used, and I put heavy stress on these devices.