I must confess I'm awfully tempted. I find my eyes strain on my MBA 13", especially when it comes to smaller text. Yes, I can enlarge the fonts but then they become blurrier and cause eye strain that way.
I'm with you. I've been a long time Windows ClearType user and just got my first Mac (2012 MBA 256/8/i5) a week ago. I can handle the Mac OS X font rendering on the TB display with Cmd+, but on the smaller MBA screen that takes up too much space, and I find the font rendering is causing eye strain. ClearType was maybe not as 'pretty', but MUCH easier on the eyes. I run Parallels for occasional W7 stuff I need to do, and it's almost a relief to see that crisp fullscreen W7 desktop...
I stopped in at an Apple store last night to look at the retina screen one more time...and the difference is HUGE. At this point I am pretty sure I will return the MBA and get the 13" rMBP instead, even if it means having to wait a month for availability.