Just to be clear, this isn't a thread asking for advice on which to buy - but rather commentary from a MBA user to those wondering what the real world differences are. I've had my base 13" model for a few months now - and really like it. It's probably the best laptop I've ever owned and has to be close to the pinnacle for the Apple computers I've owned over the years. My favorite as far as pure design goes is still the G5 tower I bought in 2006, but functionally, this MBA is so fast and light, it's been perfect. So for those contemplating getting a 13" MBA vs MBP, I can comment on both given my wife just got a replacement 13" MBP for work and I had the displeasure of setting it up for her the other night. I expected it to be faster than it was and I expected to be able to have multiple programs running without taxing the computer, but in both cases, it was wildly slower than the MBA and with just a few programs running - safari, mail, iTunes, it ran really slow with significant lag. I attribute this to the optical vs ssd drives and even with a slower, lower performance chip in the MBA, real world use makes it much faster. I'm sure there are other programs that would show the opposite, but my hours using the 13" MBP tell me that there is no way I would ever buy one. My 2007 MBA (pre-unibody) seems to run faster than this new MBA (I know, a 5400 rpm vs 7200 rpm drive is partly to blame).