I just purchased a 13 inch and have been using it for a few days. I am very happy with it, but my previous computer was a 15 inch (hp windows) The lettering on my mac look a bit blurry. I was having a tough choice choosing between the 13 and the 15 inch when I was in the store, but decided to go with the 13. I'm thinking about bringing it back and exchanging it for the 15. Do you guys think its worth it? Is there a difference between the screens?