Here is my opinion on the RCI vs Carnival thing. You get what you pay for. There is no comparison between RCI and Carnival., but RCI is more expensive...most of the time. I like RCI much more than Carnival, but I don't hate Carnival. I live in Orlando, so I do at least one cruise a year, and I've actually done more Carnival than RCI, but it isn't because I like it more. I have been on Ecstasy (the cruise right before your Klassy Kruise, actually), Destiny, and Freedom, and I am going on Sunshine over the summer. I have nothing but good things to say about Carnival, but it is certainly different than RCI or Disney.
Also, I'm super jealous that you are on Quantum...it looks amazing!!! I had a friend on the first sailing out of NY, and they LOVED it!!!!