Yes actually I purchased a macbook back in january, then went to kenya for 6 weeks. I used it for the whole time out there and really grew to dislike the machine. Screen was rubbish, which I walked in knowing, and using it with what I do, screen real estate was cramped. My hard drive died on me when i landed in kenya. Fast forward to when I got back and took it in to the apple store, who offered to replace it or exchange it so I swapped it for a 15". Not being happier.
The machine is not actually that much larger, I am used to lugging a 17" around with me, so this is still small.