I have an early 2013 Retina 15″ with a SanDisk (SD256E) SSD, also have a SanDisk Extreme, and a SSDNow V300. In all frankness, I cannot tell the difference between the three in terms of speed. They are all pretty fast.
BOOTNOTE: Mavericks is booting up slower on all of my machines, all on SSDs, and I believe this may be related to preparing compressed memory, but I am not sure.
Spec Comparison:
SanDisk Extreme – Sequential Read: 550 MBps
Sequential Write: 520 MBps
Random Read – 128 MBps
Random Write – 324 MBps
SSDNow V300 – Sequential Read: 450 MBps
Sequential Write: 450 MBps
Random Read – 324 MBps
Random Write – 168 MBps
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