The LED died after like a week on the first DA I had, the sensor on my first RAT7 started being a jerk after some time, not as short as a week, but didn't take too long. Still not sure if it was just massive amounts of dust on the sensor or if the mouse actually broke, but I had it replaced anyway.
Those are pretty much the only mice that have crapped out on me like that, the USB connector in my Habu came loose but that was after a few years and was easily fixed.