I have a Mid 2009 13" MBP 2.53GHz Core 2 Due upgraded with two 8gb of ram and a 500gb 7200rpm HDD. I am surprised at how well this machine still performs. I have SSDs in SATA 3 desktops and the speed is awesome. I have two questions. 1.Would installing a SSD in a SATA 2 machine running a 7200 rpm drive give a solidly noticeable difference? If so how much? 2. I am choosing between a Crucial M4 256GB for $170 or a friend offered me a 512GB Toshiba SATA 2 SSD (http://storage.toshiba.eu/cms/en/hdd/solid_state_drives/product_detail.jsp?productid=428 for $225. Which would you choose. Would I notice any performance between the two being that the M4 would be running through SATA 2?