I just departes two days ago after a week on the Euribia, in the yacht club.
Beautiful ship, the best staff I've experienced on any cruise. Including the non yacht club staff. The buffet selection and quality was fantastic. Like on Celebrity or NCL 10+ years ago
The service was great everywhere. It took never more than one minute from seated until a bar server came to the table in the buffet.
I had a better experience this time than on the Bellissima in september, also yacht club, that time the capacity was 60%, this time 100%.
The wine bar is not included in any package.
Go for it!