I was at the veggie "experimental" California Grill dinner, and I'm also from the Chicago area. I kept my reservation mostly because I'm very much a carnivore, and I wanted to do something completely outside my comfort zone.
I believe Jens Dahlmann was the Disney chef prior to Brian Piasecki at California Grill. And he came over from Flying Fish...which probably explains why I loved the optional (well, not optional for me!) halibut dish he served us.
I thought the seitan was not good, but that was my first time trying it. Maybe it was prepared badly? I wouldn't know. I did enjoy the wines, but I don't remember how well they paired (or not). While some things fell flat, I enjoyed my dinner and experience there. I would probably book the California Grill dinner again.
Not this year, as I canceled my F&W trip.