Our family booked the full-day rafting trip with Wild West Rafting in August 2019. We were a diverse group in age--6 people from 5 to 70--and we all came away delighted with the experience. We consider it very good value for the cost.
Our guide, one of two Pats, was knowledgeable, relaxed, and thankfully patient with our two rowdy boys (ages 5 and 8), even letting them try the large oars in a calm stretch and sit up front. We saw a herd of pronghorns, many osprey and smaller birds, a marmot, and lots of interesting geology.
We were late in the season, with the river at c. 3,000 cubic feet/second (against a typical max of 18,000 cfs), so the fastest areas weren't super fast, but they got us plenty wet and laughing and everyone had a good time.
A few other points that may interest readers:
--The lunch stop was an appropriate duration to dry us off in preparation for the afternoon journey, but not too long. The food was good and they can cater for dietary requirements.
--There was busing to and from the river, so minimal walking (about 100 feet max elevation loss and less than that of gain).
--Boat shoes and life vests were provided.
--There was an opportunity to swim off the side of the raft for folks who were interested.
--I recommend taking the loaner windbreaker even if it looks like a warm day and you don't wear it at first. You never know when clouds/wind may come up, and you'll be wet.