I'm bringing a group of HS students aged 14-18 and I have to admit, I'm a tad worried. That being said, they are wicked excited, and I haven't heard a complaint from any parents about the content. My own child is in that mix but I have no worries about him, I know what he's ready for.
My concern is more about the "other" young man you are bringing and his parents. (I'm assuming a friend of your son's.) You might want to discuss with his parents before making the final decision.
If we're not having fun, then why are we doing it?
These are DISCUSSION boards, not mutual admiration boards. Discussion only occurs when we are willing to hear what others are thinking, regardless of whether it is alignment to our own thoughts.