I received my rMB today and so far I like this new keyboard very much. It was my biggest fear with this purchase, turned out to be one of the best attribute of the machine. None of the reviews (written & video) do it justice. The feedback click is very present and the actuation force is higher than I thought, being mislead by the video reviews I watched (and I watched almost all of them): both reliefs. Other unexpected good surprise is the new layout of the arrow keys. I actually don't find the taller horizontal keys disturbing, quite the opposite, turns out to be more comfortable and less prone to misses.
Two minor issues, though quality-control related: the backspace and space keys don't make the same noise as the others, they're louder and the feedback is less "firm" (for lack of a better term). They're larger than the others but so are the Caps and right-Shift and those make a similar noise to the smaller keys. Must be defects on my units, I'll check at a Genius Bar if this continues to annoy me.