What's the battery life compared to the MBA? And I can't live without a backlit keyboard anymore. And I find the shortcuts on the number pad on the MacBooks (play, skip, volume, etc.) to be more responsive and accurate than on Windows notebooks. I'm comparing it to my 2007 HP, but most of my friends running Win7 still can't do it right, or it pauses a movie and then opens the music player and starts playing music when they hit pause. Also, gestures on the trackpad are another big thing for me.
But at the same time, the more USB ports and HDMI are things I sometimes miss, but the latter can be fixed with a $2 adapter from Amazon and the former can also be fixed with an adapter that expands one port into multiple ports. I've never really found a need for more ports, though.