An upgraded cabin in the same cabin class , an exclusive dining room on the Pinnacle class ships , a dedicated customers service line at the customer service desk , priority embarkation and disembarkation and maybe even a fancier bathrobe !
There is also a Club Orange tote bag included in the package.
These are most of the perks as I recall from Our March of 2023 cruise on the Rotterdam.
We chose to try Club Orange on this cruise.
The cost was $25. Per day per person for the Club Orange option.