The whole tour experience depends on what type of person you are. I like walking and hiking so I usually prefer not to go on organized trips with agencies, but booking a tour was the only way I could arrange visiting the park this time.
The concept of the tour was a lot of driving around the park and stoping for taking pictures of different views. We made only two longer stops, lasting one hour, one hour and a half. To be fair, the park is really big so it's hard to see everything in one day just walking, but I would prefer skipping a couple of short stops to have more time to explore during the longer stops.
The tour guide was telling some interesting stories during the ride, but on the longer stops he wasn't with us, everybody just did their own thing.
So if you are the kind of person that doesn't like a lot of walking, just seeing some nice views with no effort, you might actually enjoy the tour. But for me that wasn't what I expected.
The thing that bothered me the most, and also some other passangers, was the driving. The guide was driving really fast and sometimes it really made me feel uncomfortable. The minibus looked ok from the outside, but it was a really shaky ride. I read about that in others user's comments thinking that they are probably exaggerating, but it's completely true.