I switched about a month ago and am loving my PowerBook. The only thing I find annoying is that I have to hit the function key to use F9 or F10 in their exposé functions whereas F11 and F12 do it automatically. Currently F9 and F10 brighten and dim the keyboard. I can't seem to find a way to switch this around. I hardly change the keyboard light level so it would be so much more convenient to just be able to hit F9 and have exposé work.