I have never seen so much water in a canyon. Not even close.
The water temperature was not too bad, maybe in the 50-60 degree range. However, I've lost 20 lbs since the last time my 3/2 wetsuit has seen a canyon, so my wetsuit held a LOT of unwelcome water. Also, Tony accidentally brought his 7mm wetsuit, so he soon discovered he only needed the bottom half of it to survive. Much suffering and laughter ensued due to our wardrobe malfunctions.
We spent at least 4 hours swimming. Two of the swims seemed endless; we estimated each to be about 200 yards long. There were also many narrow hallways full of water that we had to swim through, they were spooky but awesome. Unfortunately, my camera would have done little justice in those sections. Those parts would have been best captured on a GoPro (next time!).
No doubt, Cheesebox is the best Cedar Mesa canyon that I've done. A top-shelf classic.
We saw some rope grooves at the first drop. If you go, please don't leave more. Here is a spot that everyone can easily downclimb, it just takes a moment to find it.