I have seen them on TV in the Tournament of Roses Parade. They are not only excellent at playing their instruments with clear sound, but also march very well and have a style that is quite unique compared to the Marching Bands in the US (which are many and also some excellent bands). I really enjoy listening and watching them.
I've watched these young ladies (and some guys) many times. What amazes me is the choreography that they maintain for long periods of time, AND there is never any music clipped to their instruments. It's all memorized. Hours and hours of practice and dedication.