Have I? I had a 2-hour guided tour of the exhibit by Dave Goelz!
A puppeteer friend of mine from Chicago for it as well & we went to a library the day before the tour to watch The Muppet Movie with Dave. He said that was the first time he'd seen it in about 14 years. I think I had more fun watching Dave watch the movie than I had watching the movie itself.
The exhibit was the first time I'd ever seen any muppets in person. I am fascinated by the speckles on the eyes! It was an amazing experience having a muppet designer, builder & performer there to answer all of my little questions (along with the questions of 28 others...) I only wish I could have thought of more.