I typically have unrealistic expectations of my machines so I decided to put the Macbook Air through the most unreasonable set of realistic conditions I could think of. This had to be something I might actually do while using the machine. I connected the Superdrive to the machine and started ripping a DVD with Handbrake, opened Firefox then started playing the Evolution of Dance Youtube video, and then started to copy a 5GB file over my local network onto a local file server (done via SCP/SSH). This test lasted roughly 15 minutes because it didn't take me long to get tired of watching videos on Youtube, but the test did show me that the Macbook Air is a fairly capable machine. Handbrake: The Handbrake encoding has maintained an average of 19.77fps over the course of the test and the Youtube videos froze only for a moment as I was messing about with the system settings for the trackpad. Flash video: I tested with Hulu for higher quality streaming video and Youtube videos for downloaded flv via HTTP video, but both worked fine. The encode slowed a bit as the Hulu videos played due to their more resource intensive nature. File copy: The transfer between the Air and the workstation was a steady 9MB/s over the network (both devices are 802.11n equipped) wirelessly. I was not able to recreate the core shutdown on this machine with these tests. I am not using Coolbook and I am not using smcFanControl. This is just a OS X 10.5.4 install with all updates. It isn't as fast as a Macbook Pro, but it'll do. Edit: It should be noted that I disconnected the machine from AC power roughly half way through the test.