I'm looking at getting the Mac Book Air 15" when it's supposed to be released (rumored to be around April). My heart wants to do it, but I want my head to be on-board too. A couple of angles I'm looking for: 1. Experiences from people who have switched from PC to Mac, what they think. 2. Comparison between MB Air and MB Pro. Size/weight hasn't been an issue with me, but there's something about the MB Air that I really like. Mostly concerned about durability, as I have read in MP and other places from people who mention the MBs can be a little flimsy in terms of its frame. If it matters, the laptop would be my main computer, used for Word, Excel, Powerpoint, Live Audio/Video streaming (mostly downloading, not uploading). Thoughts?