MBA 2012 11" 2Ghz i7 8GB RAM 256 SSD here. Super happy. The only issue I had was the sound distorting when going through the Thunderbolt display, but 10.8.1 just came out and fixed that.
I was worried that it'd be too small, either the screen or the trackpad (yeah, the trackpad is ever so slightly shorter) but I've found that instead I love it, it's the perfect portable size in fact I barely even notice I'm carrying it. Slightly shorter battery life hasn't been an issue for me, but I'm normally places with power adapters should I need it.