We took a different approach to the first camp. My son went to one as a Sophomore at a college that he had only a remote interest in that was a one-day bargain priced deal. It gave him valuable experience of what the process is like, how he compared to older kids, etc. But if he played poorly, it was no big deal because he was not likely to wind up there anyway. He did this before he ever went to any showcases so it was the first time he ran the 60, did the Pop time drills, etc.
Looking back I think it was really a wise choice. It was cheap and he got those first camp jitters out of the way. Just don't expect much feedback from any of the camps. The only feedback they provide is when they really like what they see and follow-up with a player. Which for most camps is like a handful of kids out of a large group.