Well after a full week with the Macbook Air I have tested every possible function and put it through everything that I would expect a portable to do. The Macbook Air is a respectable machine and seems like a good first step towards a thin light general purpose ultraportable. The current design of the Macbook Air just can't fit that bill and has several problems that severely hinder the overall utility of the machine. The Good: 1) Thin and light I noticed myself just picking up the Macbook Air to carry off and work with anywhere I happen to go. I did not do the same with the Macbook Pro and I think it is because of the size/weight difference. This is a big plus as I noticed I used it more than any of my other portables. 2) Battery life The Macbook Air seems to have very good battery life compared to some of my other portables and I never seemed to need to worry about battery life when I carried it with me throughout the day. 3) Screen quality The quality of the Macbook Air's screen seems to be far superior to the current Macbook (Note: Not Macbook Pro) screen. The Bad: 1) CPU/HD speed The system performs well when doing a single intensive task such as ripping a DVD or watching Hulu, but it seems to have more performance problems than expected with more general tasks. I have never had a problem with the core shutdown issue, but I have seen many beachballs when going through lighter tasks. This puts a damper on the "pick up and use" mentality when you need to consider how many browser windows/tabs, word processor windows, or other programs (email/IM/etc) you may need. 2) Criminal lack of ports: One USB port does not cut it. I thought this would be a minor inconvenience, but it is one of the most annoying issues about the machine. I find that 2 USB ports (coming from a Macbook Pro) on opposite sides of the machine is plenty, but one USB port can be very limiting in unexpected ways. A USB hub could solve this, but I like the Air for the "pick up and use" factor. Anything that pulls me away from that is a deal breaker. 3) Port positioning: The USB port is positioned in just a way to make a less than narrow USB stick drive lift the computer off of a flat table. This in itself isn't a big issue as that is easily solved with an extender, but I found myself needing to lift the computer to open the port latch which can be irritating. The Ugly: Parting with your Macbook Air... I love the Macbook Air and I still think it is a great machine. The problems will slowly be worked out as Apple refines the line, but for now it does not do what I expect an ultraportable to do. I will be keeping a very close eye on the Macbook Air line and I will buy one to (hopefully) keep with me at all times when the problems are all sorted out.