I have an Intel 80GB X25-M, two Crucial 256GB M4 series, a Crucial 512GB M4, and a Mushkin 240GB Enhanced Chronos Deluxe.
The Intel in the oldest at 3 years, the Mushkin about 15 months, the 256GB M4 drives about 6 to 8 months, and the 512GB M4 about 3 months.
I have not experienced a single issue with any of them. Two of them are in laptops, while the others are in my desktop.