I went to this and loved it so much I snuck back a few days later to revisit some of the things. The first time, I went with my parents and my sister (who have no interest in ballet, but were humoring me) and my grandmother (who is interested and loved it). There was a great moment a few minutes in: my father stood watching the clip of Petrushka for a few minutes and went, "Wow! I didn't realize ballet could be like this!"
For me, the best parts were the Nijinsky-related items. After reading so much about him and seeing the various ballets &c., it was surreal to have the costumes just there existing in front of me. Obviously ones like Spectre de la Rose I was familiar with, but seeing things like his costume for Le Dieu bleu was very strange - I've seen the pictures of that one in black and white loads of times and never imagined the costume to have the colors it did, or the intricate details. And I loved seeing the beautiful costume from Giselle.
I also was really pleased to find costumes from Rite of Spring and L'après-midi d'un faune. For the latter, they had three of the nymphs' dresses, and they were so delicate and beautiful. I love this ballet so seeing those was special. I was amazed to find the Rite of Spring costumes in very good shape, bright and colorful - but then they did only perform the ballet a few times. I feel like I've read so many accounts of the premiere that it seems more like a legend than something that happened, so again, the physical presence of these things was a strange feeling.
I love Valentine Gross's drawings and the Petrushka ones they had here were great. I also loved this costume from The Ball, and of course the one from Les Sylphides. And the various tickets/programs they had, too.
My only problem with it was that it referred to Romola as as "aspiring ballerina," as I've read elsewhere too many times lately.
All in all, absolutely wonderful, and I'm sure I'd return again if I had the chance. Please do go if you're at all interested in the subject.