I freaking love mac for the battery life. A year later and I'm still only plugging in once a day for short bursts.
Also you can't beat just closing the lid of your PC when you walk away. None of that "firing up while in your backpack" or those "sound like a 747 taking off" fans.
Those two things alone will keep me coming back.
p.s. Sometimes you have software running overnight and don't want it to go to sleep. A free piece of software called Amphetamine comes in handy for that (similar to Caffeine but free). I've also written a small app to get your external IP and copy it to the clipboard - useful if you are continuously having to whitelist your IP in web services. Shout if you are interested. I'll probably stick it on the app store one of these days.
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