Experiences owning both the 11.6" and 13.3" -- Impressions and Review
I am going to try to give a quick review of my experiences owning both the 11.6" and 13.3" "Ultimate" MacBook Air models. I got my 11.6" delivered on Monday of this week, and I just purchased a 13.3" from the Apple Store yesterday. Here is what I have found, experienced, and have to share about real-life experience working with and comparing these units so far.
The 11" really is a fun computer to use. I have been using my 11" more than my 13" really (well, I just got the 13" so I haven't had much chance to sit down with it as of yet). I like holding and carrying the 11" MBA better, it does feel alot lighter, actually MUCH lighter even though it is just 0.6lb difference. The 16:9 resolution is actually nice on the 11", the 13" is just better if you need the extra screen resolution that 1440x900 will give you (This is the native resolution of the standard MacBook Pro 15" configuration, on the 13" MBA). The 1366x768 on the 11" model gives you considerably less vertical resolution which may seem a bit impeding at times if you do alot of work that requires more screen real estate. The extra processor amp on the 13" model (the 2.13GHz vs the 1.6GHz) comes into play when you try to run 1080p flash, for instance, the 2.13 can handle it quite well while the 1.6GHz stutters a bit on some 1080p flash clips, although not badly. It handles 720p just fine as well as 1080p in VLC and iTunes/QuickTime player. The 2.13GHz handles everything perfectly, and gives the extra horsepower you might like when running an intensive set of operations in Photoshop or doing heavy work in Aperture (the extra screen resolution is also good for Aperture). The 256GB Flash on the 13.3" model will allow you to store a complete video library as well, while 64GB or 128GB will limit you by 1/2 or 1/4 as much that you could store internally. The 13.3" is a better mobile gaming machine. The 11.6" is the best model for carrying around the house, to work, on an airplane, in your car (it is perfect in the car), and it is VERY TINY. The 11" is small, it is as small as a netbook, but the keyboard is fullsized and there are no compromises. The 1.6GHz model I have is VERY FAST. I have Photoshop CS3 installed on it and it runs perfectly. Navigating the web is instantaneous, pages load up and render instantly, it is snappy and fast. The high resolution on the 11.6" leads to a higher PPI and so it is very sharp, but text is very tiny. It is noticeable compared to the 13.3" model, in which small text is much easier to read. The actual difference is 128ppi (13.3") to 135ppi (11.6"), and YES it is quite a noticeable difference. My eyes can tell. If I were to use the machine for a long time (more than 2 hours) I would perfer to work on the 13.3", I could work on that machine all day.
Both units together:
As for battery life, the 13.3" after full charge reported about 8:40 of battery life remaining! I am still on the first charge!! (and I bought it yesterday). Yes, quite amazing. I have used it about 5 hours so far and it still has over 2 hours left on the battery. My 11.6" I have had since Monday and I have charged it 4 times. The battery lasts about 5 hours as advertised, the battery life is very good, and I am very impressed by this little machine. I found that when you do a video chat in iChat, it eats through the battery very fast, you only get about 2:45 hours of battery life on the 11" when you run video chat in iChat, but under normal use you should get 5 hours. The "deep sleep" feature is nice and works as advertised. It preserves the battery life after having been asleep for one hour and goes into deep sleep, where it can last up to 30 days and still have "instant-on" --the battery management on these machines is truly incredible. Apple has done away with the "sleep indicator" light on the unit which helps preserve more battery life. There is no pulsating white light, ambient light sensor, or backlit keyboard on either unit. You just shut it and it goes off.
As for boot time, these puppies sure do boot fast. Less than 15 second bootup and restart to desktop in 12 seconds flat. They are super-fast at booting and restart! The new hardwired Flash SSD is really incredible on these units. Applications load up very fast on both of my MBA units. I am very happy with my new MacBook Airs.
Okay, I think this has been a lengthy post here, please feel free to ask any questions or comments below, this is my "half-review" here, and a few comments on experiences with both machines. I tried to cover everything, but there is much more!! I will try to do a better review later this weekend.
Perhaps boot times, but I usually leave my system on for months without rebooting (51 days, 16:59 hours according to Terminal), but I suppose you could have gotten good boot times from an SSD installed in a 15" MBP. 
