Well, I got my MacBook Air (2010 1.6, 4GB, 128GB, 11") from eBay and played with it. Few observations: 1. As an iPad user I found the MacBook Air to be completely unusable on the couch or in bed. There is no way it could ever take place of an iPad. 2. As such, the MacBook's place would be to do real work on the go (like in a library, a client's office, etc.). To that end, the 13" is superior because you get more screen real estate, longer battery, and better specs. Overall, the 11 wasn't a bad machine but again the iPad spoiled me, this time in the area of battery life. After using it for just around 2 hours the battery hovered around 55% (from a full charge). That's crazy! I got used to not even worrying about battery on my iPad and charging it once every several days. Now with the 13", I have been using it about an hour (down to 58% battery since it wasn't 100% charged when I took it out of the box) and it still says 2:30 left. So around 6 hours on its very first charge versus basically 4 hours. That 2 hours makes a big difference. Plus, getting the SD reader is a nice bonus, since I own many SD cards, so even though I won't use it too often it will be nice to have. I can probably put some videos on a 32GB SD card and take them on a trip versus using my limited storage. Its better/smaller than flash drives. The last thing it the display. I think the 11" resolution is a bit tiny. I like that it had a lot of real estate but it was not too comfortable to do any significant reading work on. The 13" resolution is PERFECT. So yeah, basically I switched to the 13" Air and couldn't be happier. I think the 11 is still good but has too many drawbacks. Maybe once the 11" battery gets extended to 7+ hours it will be a great laptop, but right now I think its just too short for comfort.