I have a Mid '09 MBP with 8GB RAM and the 500GB 7200 HDD. Looking to finally put an SSD in it, but with Yosemite, I see the kext signing has introduced new headaches with regards to TRIM. I have been going back and forth on which SSD to get as I know I only have SATA II so going with a SATA II drive is no issue. With that said, I would prefer to go with a Sammy drive just for the reliability. I seem to be a bit confused about OWC drives, however. Do they not need TRIM enabled, thus negating the turning off kext issue? If that is the case, I wouldn't mind going that route for one of their 240GB drives. How reliable have the OWC drives been, though? I know Cindori has some patches to combat Yosemite kext signing and I would need to disable TRIM every time I update OS X, so not really an issue IMHO. However, Samsung also is rather, non existent, shall we say when it comes to being user friendly in updating it's SSD firmware on OS X. If I have Parallels 10 installed with Win7, could I just update the firmware on Windows or is it OS X specific firmware that needs to be updated via OS X? Just a lot of questions needing answers before I plop down the $100+ for a new drive. Also still trying to decide what I want to do with my old HDD once I remove it. Thought about moving it to the optibay, but also may just use it for a back up drive, externally. Thanks for any and all answers/help.