I purchased SanDisk Extreme SSD 240 GB from Amazon and it was delivered shortly after WWDC 2012 Keynote. Prior to installing it on the MacBook Pro, I went to SanDisk site and download the latest firmware for this SanDisk Extreme SSD.
Mac users should update the firmware to the latest version before installing it on their Macs. That’s because the firmware updaters most likely requires Windows. The update process will wipe out the content of SSD.