Congrats! We finally dipped our toe into that pool on the "Nav" last month. The only difference between being "Diamond Plus" and the "Owner's suite" amenities was the tray of "goodies" (petit fours?) delivered 4 or 5 times during our 12 night trip. You should have a "free" doorbell too ()= ;>) Vision class doesn't have a concierge or lounge for "Diamond" & suite guests so I'd also be curious to see if they provide any other perks for you.
We did enjoy the cabin and don't regret the additional expenditure at all. Hope the same is true for you and yours, Robbie