MLBTR has been running interviews with players about how they chose their agents. Bruce signed with Boras Corp. first, then dropped them before the draft. He has some very interesting comments:

This is no slight on Scott at all or anything that they did, because they are one of if not the best at doing their job for their players. It wasn't anything necessarily that they did wrong, but I wanted to take a different approach to the way I "marketed" myself, because they didn't want me hitting for any scouts, they didn't want me filling out any information, they were really really pushing me to go to college. Some guys, that works great for. But I wanted to give myself the chance to be drafted as highly as I could, and they didn't need to push me to go to college, because had I not gotten drafted in the first round out of high school, I was going to college. I signed a letter of intent to go to Tulane University, and I was going to honor that. I had no problem going to college.

It was just not as open of a relationship as I would have liked. They just didn't seem like the way that I wanted to represent myself, they didn't sit well with me. I like talking to people, I like really giving people the impression of myself, from myself. I like people to know what they're getting. They want to keep the distance with high schoolers, I think, between the scouts and the player. Which for a lot of guys, it works, but I just wanted to give myself the opportunity to make the best impression I could on all these people. They never did anything wrong to me, but I just decided to go back to Sosnick Cobbe. They made the best impression, and they were straightforward. It became a relationship that kind of transcended business a little bit. A lot of people don't like to mix business with friendship, but if I can trust someone that I consider a friend, I can trust them to do business.

The full piece is here.

I think it's worth remembering Bruce's description of Boras' secretiveness the next time somebody attacks the Pirates for not realizing Appel wouldn't sign. The idea that you could get a realistic read from Boras before the draft should be absolutely ludicrous to anybody who's followed his antics over the years.