I recently did this, or at least, I tried to. After a month I ended up having to sell the iBook and go back to my PC. The reason I had to do this is because I am a computer engineering student, and computer usage is very prominent in my coursework, and unfortunately, it is all pc-based. I reached the conclusion that I do prefer working in OS X as opposed to windows, but for me, it just wanst feasable. So, basically, if you are using a computer completely on your own terms, than you should definately check out the Mac. However, if you are in a position where you are required to use certain software for certain things, it may just be more trouble than its worth.