Coast to Coast is 'legit' - one of the best baseball experiences my son participated in (Puerto Rico). Unlike a lot of other baseball "junkets", kids do not make the team unless they are good. The tryouts are well run. I was kind of surprized at the kids that were not offered spots.
Extremely well run and organized, excellent competition, accomodations excellent, coaching and training staff excellent.
Coast to Coast won't get your son a lot of 'exposure'; it will get him a great baseball and cultural experince. However - there were a fair number of college coaches on staff when my son played, and his coach (D2 recruiting coordinator) made several recommendations and offered himself as a reference.
As a side note, one of the P.R. umpires remembered my son from the 2003 16/u NBC World Series. It's a small world, and coaches and other baseball people do get around...
PM me if you want more info.