I've been reading and reading here and many other sites and I can't seem to figure things out as it relates to which SSD to buy. My machine is a mid-2009 MBP 13" 2.26 Core 2 Duo (MacbookPro5,5) running Mountain Lion. Things I'm not understanding: 1) It sounds like I can't just buy any reputable (Crucial, OCZ, Intel, etc) SSD for this machine, some will work and some won't? By work I mean show speed improvements. 2) TRIM for 3rd party drives...enable? I've seen anything from using the Trim Enabler app, to that app messes up OSX, to enable trim via terminal, to don't do it at all? So do I need to enable it on my machine? 3) SATA II vs. SATA III - I know my MBP only supports SATA II, however I've seen some people say to get the Crucial M4 instead of the V4 because the V4 has issues. I don't see the point in paying for SATA III when my machine can't make use of it. Thanks for the help!!