Are they any good for the price?
Where are you planning to go and do you have an eye on a specific itinerary of theirs?
I post a lot on the Trip Advisor Yellowstone forum. Pre-Covid some people posted good reviews of Caravan tours of the Yellowstone/Grand Tetons area. However, for my money they move too fast and don't spend enough time in the parks.
Looking at MEXICO CANYON TRAIN TRIP