I recommend to stay away from SATA III until the open question regarding SATA cabling inside the MBP is clarified.
Fact is that:
- the SandyBridge chip set supports SATA III
- Apple has not disabled SATA III mode of the port
- Apple does not officially support SATA III
- Apple does not ship any SATA III stock SSDs
- Several sources stated that the cabling inside the MBP is not supporting the higher frequencies that SATA III requires.
So internal SATA cables are the weakest link in the chain. Problem with SATA II cables used for SATA III links is that it might work with some configurations and might not work with other configurations. It is quite a random gamble. This thesis is supported by the fact that some folks have no problem at all with SATA III, but other people have significant issues.
So I rather have a great SATA II controller-cable-drive link than a whacky dubious SATA III chain.
So from that perspective the OWC SATA II SSD's are a great choice.