I've never done this. Somehow, I've always managed to live my computing life on a laptop screen. I'm not a fan of desktops. And I always thought about buying an external monitor but never did. When I had the Air, I thought about getting a Thunderbolt Display but for whatever reason I never did. And with the rMBP, my concern was that I'd hate using a regular resolution on a monitor after using a Retina screen on my laptop. I guess now I have more excuses with the rMB only having one port. I guess I could buy the $79 Apple adapter and hook it up a HDMI display. I'm also wondering how well the rMB (even at 1.3GHz) will run an external display. So is it really that awesome? I'd love to see an Apple display that supports USB-C. It seems that most third-party monitors lack good built-in speakers.