I've had a Retina MacBook Pro for a year now. At first, I was very hesitant to spend that much on a laptop, but it's turned out to be one of the best and most satisfying tech purchases I've made, and it's the best computer I have owned.
I use it to create and edit all of the content for GTPlanet at all the Gran Turismo events. I'm often hard-pressed for time during these things, so performance and stability is a priority for me. It quickly processes video edits in iMovie, and keeps pace when I'm rushed or trying to move big files around quickly.
The Retina screen is both the best and worst thing about it - it's just so gorgeous to look at it. Have you ever experienced that feeling of having a hard time putting your iPhone or iPad down, or have just made up an excuse to use them? It's kind of like that. I go out of my way just to look at this thing. The only issue is that, although most popular apps are updated for HiDPI graphics, not all are, and something pixelated on such an amazing screen can be a bit jarring. A lot of graphics and photos on web pages also aren't in HiDPI, but you get used to it. (GTPlanet's new site template will be compatible with HiDPI displays.)
Another issue I have is the lack of USB ports - there are only two.
Battery life is great. At E3 this year, I had a full day of editing videos, posting and browsed GTPlanet heavily, and managed managed my questions for Kazunori using the computer, and never needed to plug in.
As mentioned, I do think it might be wise to wait another month or so to see if they begin offering Haswell chips (more on that
here). Otherwise, I highly recommend it.