I did a half day ride at Bryce Canyon a couple of weeks ago. It was a pretty good experience overall. The scenery was stunning, the horses and mules were well trained, and we couldn't never made it on our own (at least not in three hours).
Unfortunately, the guides/wranglers/whatever they are called were mediocre at best. To begin with, they were kind of rude. I had to wait for a few minutes for two of the guides while there were chatting about picture taking techniques while I was clearing waiting to register for the ride, standing in front of them like and idiot.
They weren't very personable while helping you to get a horse or throughout the ride. They almost never stopped for the pictures. They hardly ever pointed anything out. In the best case they would say something like "Look behind you, you will see Queen Victoria hoodoo". I had no clue what they were pointing to. They also said something to the effect of "Queen Victoria was one ugly lady", which I thought was pretty low class (even though they were playing roughneck cowboys). I couldn't believe they had the audacity to ask to for a tip for such a "great" customer service.
So while the ride was entertaining, it was not at all educational. It also would've been a lot more enjoyable if the guides didn't sound like drill sergeants but instead got some education on the history and geology of the incredible place that they are showing to the visitors.
Unfortunately, they are the only outfit authorized to ride in the Bryce Canyon, so you have to go with them.
BTW, the same company does rides at Zion, but the guides there are WAY WAY better.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.