This is incorrect; at least with the MBPs they were shipping until today it was a bit of a toss-up as to whether you'd get a Samsung or Toshiba SSD, and the only way to know what you got is to boot up the system and look at the drive's model number in System Profiler.

FWIW, the one that came in my MBP is Toshiba, and is still awfully zippy after eight months of heavy use (during which I'm quite certain I've written enough to the drive to start noticing any real degradation).