I don't really recommend this tour to anyone. The castle is quite far from Kyoto and Osaka, so it means a lot of time spent siting on a train as opposed to actually visiting sights. I expected to be taken on a bus, but we actually went on Shinkanzens and local JR trains. Since I had bought a JR pass I could have taken these same trains to visit the castle free of charge as opposed to paying for a ticket that was pricey because it included the train fares.
The castle itself is more impressive on the outside than on the inside. Snapping a nice photo or two of its exterior will likely be the most worthwhile part of the tour. The inside of the castle is gloomy and empty. There is absolutely nothing to see as you climb up six stories on steep, ladder-like staircases, and then climb down. Aside from a small altar on the top floor, the castle is bare walls and bare wood floors. In the summer heat, it's also quite stuffy. When you leave the castle you head to lunch at a buffet style restaurant in a local hotel. I thought the food was quite mediocre, to be honest.
After lunch you take a long JR local train ride to see the world's longest suspension bridge. I personally felt it was not worth it going so out of my way to see a bridge. You do go up in an elevator to this sort of caged-in tunnel under the bridge that lets you see the ocean below you. Again, not very interesting or impressive.
After this you take a very long JR local train ride back to Kyoto or Osaka. One the way to the castle the bullet train makes the ride faster, but there are no bullet trains where the bridge is, so the slower JR trains are the only choice for going back to your starting point.
Overall, by the time I got back to Kyoto at close to 6pm, I felt like I had lost a day of my trip. There are simply so many wonderful and interesting things to do in Kyoto that I did feel it a bit of a waste to travel so far to see an empty castle when Kyoto's imperial palace was actually nicer. The tour itself is not at fault for this. Our guide was very nice, friendly, and funny. Her English was pretty good, and she had a positive attitude throughout. The tour does make you walk quite a lot, so if you have any mobility problems, take that into account.