@CoachJackE: I can only tell you our experience. NTGson pitched well against Canes 14U in a very large tournament's championship game and was subsequently asked to join their 14U team as a guest pitcher at the 14UWWBA. From that point on, he played through his 17U season in the organization and never was asked to attend a tryout. In those 4 years the number of teams more than doubled and the organization regularly conducted highly-publicized tryouts.
http://canesbaseball.net/News....sbaseball.net#333736
The National Teams at 16U and 17U are a compilation of the players whose resumes are built on their success in the preceeding year's performance as a Cane and the level of interest they have generated within the college and pro coaching communities. Each year there is a small influx of players who have demonstrated their skills for other teams/programs. Those players, we assume, are invited to join the program as our son was at 14.
As with all organizations there are shortcomings and strengths of the Canes. We found the experience most beneficial for our son and would recommend the organization.