I went on this trip with a few of my friends before our graduation from UMass and we had an amazing time! It was early in the season so the water was cold, but we were comfortable in the wet suits provided. All of the workers were very friendly and clear with instructions (we were first-timers).
We loved our guide, Micah! We had no doubt that he knew what he was doing as he guided us down the river, making sure we were having a good time. He really made the trip a fun experience with his sense of humor and vigor.
We did the trip that stops for a picnic about halfway down, which was just what we needed. We proceeded to the water fights (which apparently you can opt out of but I don't think any of the boats did) where we got very competitive with the splashing, and after a few more rapids were at the end and exhausted. It was awesome.
I have been recommending the trip, with Micah as a guide, to everyone I know. I can't wait to go again!