Bought this machine 4 years ago. 2.53GHz 13" MBP. Immediately upgraded to 8gb of 1066 ram and a 500gb 7200rpm drive. It always ran great, but lately it was starting to feel a sluggish especially compared to my Windows desktop running a two disk Riad 0 Sata III SSD setup... Just installed a 250gb Samsung 840 SSD and man does this puppy scream for a 4 year old machine. SSD is the best/most noticeable upgrade you can possibly do.