Did you actually get the SanDisk SATA III 960 for $230, and, if so, where? (Or did you get a SATA II?)
I got a
SanDisk Ultra II 960GB SATA III while it was (deeply) on sale. And I correct my price, I paid $260.
Hmmm... Would my SATA II MBP perform as well with a SATA II SSD as it does with the SATA III, and did I just waste money buying the III? Aaargh!
AFAIK, SATA3 will just fall back to SATA2 protocol when attached to a SATA2 adapter. So a SATA3 device will perform like a SATA2 when accessing it from a SATA2 interface. If you were hoping for better, yeah, you did waste your money.
I don't know offhand if my Late 2011 15" MBP is sata2 or 3, but whatever it is, it's really flying.