My 15 year old went to the first session. There were a lot of kids there, probably in the 100 range. He had a good time, thought it was worth the money (of course, it wasn't HIS money!!). He was glad to have some specific catching coaching, which he has had very little of so far. He also had never been timed/evaluated before so it was a nice opportunity to see where he compares with the statistics.
It is a real personal challenge for him to be the best at whatever it is he does, so it was also motivating for him to see catchers that were better than him.
However, after I sing the praises of this camp, remember that this was our first camp adventure and I have nothing to compare it to.