Logitech has yet again replaced a mouse for me! First, it was my G7 that had problems: the left click kept clicking twice when I only pressed it once. Logitech kindly replaced it with a G9 for me back in January 31, 2008. Now, August 28, 2012 — 4 years later — my G9 side buttons had worn out. I contacted Logitech, and they kindly replaced it with a G9x! So next time you get a computer accessory, I recommend Logitech.
P.S. My brother’s Razer Copperhead has problems and Razer doesn’t care. All they keep saying is that it has a 2 year warranty.