This. I kept debating between getting the new rMBP and the rMB. Within hours of actually using the rMB, all my reservations about it vanished.I LOVE this little laptop. By far, the best MacBook (Air, Pro or otherwise) I have ever had and I have had several over the years. For what I do, this is all I need. Plenty fast, great battery and the screen is amazing. And it noticeably lightens my bag which I carry everywhere I go. Again, the best laptop Apple has ever made.
What you're transitioning from matters. I've never had a Mac later than mid-2012, nor one with more than 4GB of RAM. Between the RAM boost and the faster SSD, the rMB actually outperforms by mid-2012 iMac, 11" mid-2011 MBA, and 13" mid-2012 MBP.
I'm faster on the new keyboard, and don't have any complaints about it so far. Even the much-derided arrow keys haven't caused me trouble. Once I turned off force clicking (which interferes with drag-and-drop operations), the new trackpad has been awesome. As far as the ports, I've never been the type to use more than one port at a time.
I'd caution anyone on the fence about paying too much attention to tech writers' reservations. Just try it for yourself and trust your own experience.