They are very expensive and do provide some exposure. (not enough to warrant the cost imo)
They are a business designed to make money. Once you sign for one event, you will get expert sales people trying to sell more of their programs. When they put together teams for major tournaments (PG, JO, etc.) They are very expensive, not very competitive, and limited playing time (because of the size of the rosters). It is a great vacation and they travel first class (if that is what you are looking for). Some people love it, but there are better ways to spend your recruiting exposure dollar, imo.
Read the link below.
http://hsbaseballweb.com/eve/forums/a/tpc/f/6616002781/m/584108008/r/584108008#584108008