We just gopt back from YBOA Nationals in FL and saw some AAU state champs down there. Hopefully you will get to check out the FBVA Comets - coach is Jack Givens, his daughter and Tree Rollins daughter are both on the team. And the star is a small guard who has tremedous skills. Also saw the GA state champs and runners up, as well as the TN state champs (they handed us our butts on a platter!).
Come with your A game, these girls can play. It will (and should) be a physical game. We had to adjust as we got pushed around a little, but when we got used to it the games were great. And yes, you will have a shot clock at all National games, and I think they are also required for medal rounds of qualifying tournaments. At the pace the games move, you won't usually need to care.