No full breakfast Diamond benefit was given, was the usual $10 upcharge for full buffet, no complaints. Maybe Diamonds get the full buffet if you book a La Vista Club room?
No room upgrade for this Diamond either, I suspect the "La Vista Club" has restricted the upgrades you can get here, as I doubt they will freely upgrade to those rooms. Expect the room you book.
They have also sectioned off a bunch of the best pool loungers exclusively for La Vista club members, causing a bit of a crunch for the rest of the spots.