This is a hard beast to find. Trying to upgrade my son's MBP. I originally bought an OCZ Vertex 2 480GB (sata II), but stupidly didn't realize it was a 3.5" drive. He uses the optical drive a lot, so using the opti bay isn't an option. Time to return the OCZ. Trying to find an approximately 512GB sata II 2.5" SSD has turned out to be a pain in the arse. I'm about to get a Samsung 840 EVO 512GB (sata III), but am wondering what other people's experience are with that drive in a sata II MBP. I found at least one thread where people had problems (i/o errors in the console log) enabling TRIM, but the thread was inconclusive if the problem was the nature of sata II <--> sata III down stepping, or if the SSD itself was flakey. Other suggestions are also welcomed. Any input is appreciated, thanks!