Currently deciding between the two. The 13'' MBP from Apple comes with the education discount, and costs £856. I can get a used 15'' MBP, 2.5Ghz, 500GB, 9400/9600 for £670 plus shipping. For those of you who have the older gen 15'' models, how are your batteries holding up ? Obviously i wouldn't get the same life from a used 15'' as a new 13'' but if i can get 4+ hours with a new battery i'd be happy. The used will also come with Apple Care until Jan 2012.