In February I purchased a brand new 15" MBP MD322LL/A. I immediately upgraded to 16GB of RAM and a Crucial M4 256GB SSD. Over the last month I have noticed progressively more beach balls and unexpected quits. Last night the drive completely failed. I did have TRIM enabled and running rev 0309. At first, the drive was lightning fast but failing after 3 months is unacceptable. Hopefully I have better luck with Crucial's warranty.