Totally depends on what you're doing with it, but - fwiw, I've had a rMB for over a year and I love it. Is it the perfect computer? No. But it does what it does pretty well. I originally got it as a light portable computer, as my main laptop is a maxed out desktop replacement dell, and is 7 pounds. It is extremely fast, and does everything I throw at it very well, but it's damned heavy, and the fans are loud and near-constant. The macbook allows me to have a much smaller backpack, and much better mobile experience. I was surprised to find that I was actually able to get a lot of real work done on it and, for the last ~ 6 months, I've been using it as a daily driver - plugged into a 27" monitor and external keyboard ~ 80% of the time, and then in a bag for quick travel. My daily use is to have a word doc + code editor + ~ 30 tabs open in browser + light excel work, and it does all of this very well. It handles light photoshop work just fine. It bogs when I get into large excel files and heavy PS work - but that's not surprising. I'm more surprised by what it DOES do than what it doesn't. Overall, I'm Extremely happy with it. The keyboard, definitely takes some getting used to. It's not my favorite, that's for sure. But it works...and works fine after some practice. I couldn't find another lightweight ultrabook that did what it did as nicely, with as good of a tactile experience as this one. If you had the $, I would say upgrade to a 13" Macbook Pro, and have best of all worlds. But - if choice is Air vs. rMB - for me, it's rMB all day, every day.
Just an opinion, and happy to answer any questions. Either way - hope you get a computer you love!