We booked both the Illuminations Dinner at Epcot and the Safari Celebration at Animal Kingdom on our last trip.
I'll describe our impressions of the Epcot dinner in this post, and tell about our Safari experience next.
The Epcot dinner was nice, but I had several complaints. First was check-in. They told us to be there early, but then wouldn't check anyone in until right before the time of the dinner, and there was a mob effect at that point - didn't feel very exclusive at all. The dinner buffet had a good selection of international foods, and it was of pretty good quality for a buffet. The Odyessy building is okay, but not that attractive. Otherwise, I think the best way to describe the experience was like being at a wedding reception. They had a DJ and a hostess, the kids all danced, etc. The only thing that made it worth while, in my opinion, was that characters came out to dance with the kids, including Minnie.
After dinner, they had the dessert reception behind the gift shop that is at the entrance to the WS from FW. Desserts were very good and plentiful, including coffee, etc. However, it was somewhat crowded, and there weren't tables or anywhere to set anything down, which was inconvenient, especially with kids. Also, we got there a little later than others after getting pictures with Minnie and Goofy, and by that time all the space at the rail had been "claimed" by adults who were not considerate enough to offer children to stand in front of them. We just had our daughters (ages 7 and 6) go up and ask a few people to let them stand by the rail, and a few people allowed them up to see the show, albeit with reluctance.
For the price and the hype, I found the whole experience pretty mediocre, especially by Disney standards. To me, the whole purpose of paying for a private gathering like this is to avoid lines, crowds and pushy guests - unfortunately, the size of the group and administration of the event did not avoid these things. I wouldn't do this experience again.