It is awesome and important to experience this site, especially at $10 per vehicle. Take the time to view the video and listen to a ranger talk if possible... this will help your party understand the story, especially if you are traveling with kids or teens. The ranger talk also discussed both the Euro-American and Native-American perspectives, which I much appreciated.
There is a short walking tour at the main visitor site, and another walking tour at the far end of the car tour. The car tour is a great way to get a sense of the scope of the battlefield, and the descriptions along the way are very helpful.
We spent 3 hours here, and if the park wasn't closing would have spent a bit longer. Definitely worth a stop if traveling between Yellowstone and Mount Rushmore, as we were, even if you have to go a bit out of the way.
This review is the subjective opinion of a TravelPod member and not of TravelPod.com.