We got a late 2012 15" rMBP for my wife. It's replacing her 2007 13" macBook. Same price.
We're completely thrilled with it - whenever I use it I'm thoroughly impressed. My machine is a 2010 27" iMac, and her specs are roughly on par.
Her machine is snappy as all get-out. If anything lags more than about 200 milliseconds you notice. That rarely happens.
The retina is beautiful to look at, if a bit cold in terms of color temperature.
Battery life is spectacular. She uses the computer (active screen with video or radio streaming) about 4 to 5 hours a day and the battery is rarely lower than 80% at the end of the day.
As most people have mentioned here, whether this machine will suit you really will be determined by what you expect to do with it, and what compromises you're willing to make.
I especially appreciate the completely integrated aspect of OSX. No hunting around in obscure menu trees and popping open dialogues rooting around for the setting you hope is there - just SpotLight search and it's right there.
I'm not familiar with most of the power-user aspects of the OS. I learned OSX with Tiger, and I wind up finding myself pretty set in my ways (sadly). Once I start to do something one way, I wind up defaulting to that forever. So some of the features like LaunchPad, AirPlay, etc don't get used very often. Not because they're not useful, but rather because I just don't know why I'd use them.
My wife uses those things even less.
