Our coach (Coconino) was very clean, spacious, and nicely equipped.
Our coach steward, Ron, was very friendly and informative. The only problem we had with him was that he talked to much and way too loudly. Example:
on the return trip to Williams, he urged us to go ahead and take a nap, then proceeded to talk and laugh at a deafening decibel level. No one who wanted to doze off could possibly have done so.