Loooved the tour, sights were fantastic, information was great, and the dam itself was really impressive up close. Really enjoyed the fact that we got to go inside as well! The drive was nice, and even got a nap on the way back.
In fact, the only drawback was the guide, hilarious at first (with all the dam jokes), it started to get old when his heavy conservative side started to show. Occasional jabs at the economy, young people, stuff like that is all good fun! But it gets pretty old after 4 hours...