Bought to replace an M4 128GB which began to be limited, I am very satisfied :-) In terms of performance, any SSD is worth more or less in standard use, so if I took it despite its price a little higher than what is done now, it is for his 5-year warranty and this is what is closest Crucial SSD, thanks to its Marvell controller.
Point by negative against, do not bother you like me to want the version "desktop", support do not allow me to set the SSD in my case (Antec P183). Take the notebook version, you save even a few parts.