Food: Just wow. A 13-course kaiseki dinner. It is the most "true to the seasons" meal I have ever eaten. And I happily ate a dozen or so things that I had no idea what they were. Here are two good primers on kaiseki: Understanding Kaiseki & Japan Talk: Kaiseki.
Wine: I drank two types of daiginjo sake that went beautifully with most of the courses. If you're new to Japanese beverages (like me), maybe they do a beverage pairing, which would be worth it.
My take: This was a wonderful experience. The food was top-notch. The setting is traditional and calm and lovely and the service outstanding. It has 2 Michelin stars if you care about that. But that's not the reason to go. Unforgettable.