Remember when people decried the MacBook Air as a dumb idea when it first launched? Well, given the amount of Ultrabooks that are now floating around the world, we bet they've not shared that opinion publicly too often. The most recent vintage of the unit gained USB 3.0 ports, Ivy Bridge chips and, well, not the one thing that would have made the unit unbeatable -- a retina-class display. No, instead that feature was reserved for a different line, letting rivals like the Zenbook Prime beat it in the resolution stakes. But aside from that notable (and for Apple, lucrative) omission, how have you found these machines? Tell us what you've loved, hated and, most importantly, what would you change?