While in Cancun, we used Gray line to see Chichen Itza. They were timely in pick up and gave us some useful info but the light show at night is not for people with little kids.
Also, the tour guide was unfriendly to the english speaking tourists and often acted as if he was a professor with a very condescending attitude especially towards Americans. He says he is the only one for this tour from cancun for
the past one year, too bad. Also, the info about Chichen Itza was
mostly in Spanish with a few scattered english. I would not repeat this experience.