We travel extensively and this was one of the best and best value experiences we have had. Our Navajo guide, Sharlens (please forgive the misspelling) was knowledgeable, personable and informative in every way.
The open air truck was comfortable, a little high when alighting but no problem unless you have a disability or injury. It also added to the feeling of being in the valley.
I would, however, make sure you have a handkerchief to cover your nose and mouth. A couple of idiots went by us so fast we drove into clouds of dust.
Overall, can’t recommend highly enough.