Hello,
I've often used the CCR and can't understand why everyone makes such a fuss about it.
Aside from the more convenient direct access from just after South Security, it's just a smaller version of the F lounge.
If there's any difference in the food offer - apart from it being eventually brought to your table v. having to pick it from self-service / order it from someone who seems remote, disinterested - then I'd like to know what it is.
I've never used the Cabanas, so can't comment on these. I have used the Quintessentially concierge service a couple of times, but they've provided nothing I can't readily access through local knowledge of where I'm going or - through opening up a guide book - access just as easily and usually more objectively.
I've routinely used CCR for accessing the lounges without an extended tour of T5 shops and then plonked myself in the F lounge for more peace and quiet, a self-service option which I'm quite happy with and some distance from all of the wannabes.