I included some information on the club level in a post on page 338 that might be helpful to review.
The food does change daily. And for my party of 3 it was well worth it for the light snacks and drinks. We drink a lot of water, coffee soda and, on this trip, champagne since it was included. (Typically I do not purchase alcohol at DLR when traveling with my mom and daughter.)
We were there during the return of the parade/world of color plus dapper day weekend. It was a busy weekend all over, but we were always able to easily find a table in the lounge. Even during the evening fireworks. The lounge at the Grand is much larger than at
Disneyland Hotel (we often had issues finding a spot there.)
There were items that I assumed were gluten free, but were not marked. I try to avoid gluten (but am not celiac) and had options to choose from...nothing too exciting or extra ordinary (hard boiled eggs, meats, cheeses, corn chips, salsa, etc). I did not ask the hosts for gluten free items...I am sure they would have been very accommodating if I did. Again, it's not a requirement for me, just a preference so I often don't communicate with servers and just do my best in picking items.
Hope that helps a little!