I just purchased a 2011 MBP 13" i5 and I have been researching the various SSD options. It appears that the main concern with the SSD drives is with the unpredictable compatibility issues that seem to arise. Regardless, I am strongly considering the Crucial M4 64GB SSD due to its SATA-III interface, Marvell Controller and the current low price of $115 on NewEgg. Has anyone used the M4 successfully in a 2011 MBP 13" i5? Similarly, if anyone has successfully installed any aftermarket SSD in this particular unit, I am interested in hearing the brand/model you used. Thanks.