My son and I did a tour with John. It was a FABULOUS experience. John was engaging, interesting, incredibly knowledgeable, unfailingly pleasant, and enthusiastic. If I do a tour, I want to learn some things I otherwise wouldn't have learned, and John delivered well above expectations. We learned a ton and had a great time.
John also showed up right on time, and the meeting place was clear and as expected.
I would strongly recommend this tour to those visiting Monument Valley. You will get much more out of your time than trying to travel the tour road yourself. WELL worth the cost.