Basically I currently have the 13" macbook pro early 2011, i'm thinking about trading this for the 15" 2010 model. Still in good condition and has about 150 cycles. Do you guys think it's a fair trade? I always wanted the 15" but never really got the money for a brand new one. So i'm just asking you guys for your opinion, but personally i really like the 15" my friend has.