Overall this tour was great, especially for someone with limited time to see the Grand Canyon. It's long, but worth it. The bus is great, comfortable, and way better than the other tour vans I saw around the area, especially for a 14 hour day!
My one recommendation is to give the drivers a refresher on safe driving. I booked with Detours after reading reviews of other companies and their poor driving. Our driver was really knowledgeable and friendly, but there was definitely some white knuckle driving. We were going an average of 80mph (or more) through the mountain passes, there was one point where he was snacking and driving with half a hand, it was dark in Elk country, and it was raining which is unusual for the area so the roads were probably quite slick. In addition to this, there were a few times that he would tail another car and flash his high beams to get them to move over instead of slowing down, and one time when we passed a car on a 2 lane road and there was an oncoming car so we had to slam on the breaks and move back over. Definitely scary. I noticed other people on the tour were noticing as well and looking at the speedometer and commenting. My recommendation is to remind your drivers that slow and steady is preferred, saving 10 mins isn't worth it.