I gotta say, I've had the 13" non-TB for a few days, and it's grown on me quite a bit.
My wife has the hdmi dongle for her 12" rMB, and we've been sharing it with the monitor and her Logitech keyboard/mouse...just dealing with the 1 port for charging/usb/hdmi is surprisingly convenient.
I have 4 desktops open, 3 instances of safari with 12 tabs total, sublime text open, skim with a PDF, and am listening to a podcast - CPU is about high 80s-mid 90s idle (97% idle as I type this), memory pressure is 1/3rd filled and green, and everything is snappy. Although I'm using just a 1920 x 1080 monitor.
But I'm really liking it so far.
edit --
lol, and right after I type this and disconnect the adaptor/turn off the keyboard/mouse, I get a graphics error. On the laptops display, the mouse lags and shows trails, and windows keep flickering in and out. I restarted it and it's fine now..