I love this show, but ironically I hate the real thing lol. It really depends on who is singing though, some people really know how to put on a show, others not so much.
I think there is this girl that disney "plants" in the show. I saw her twice about two-three weeks apart. She lost both times, once in the first round of shows, second time in the finale. I know for a fact she is the same person because I thought she was ridiculously annoying and already super confident on the stage.