I returned my 11 inch macbook air today. I just couldn't get past the screen. It was very washed out and the pixels were screaming at me. Haswell at 1.3 ghz did seem really slow and choppy also. So I am back on my rMBP. Im pretty sad because I was looking forward to the battery life and compact size. In the 2 days I had it I also wasn't too impressed with the battery life. I was getting about 6 hours out of a charge.