She did an amazing job, WTF at that cheap mic though? It's not just the person in charge of the audio, the mic itself is one cheap mess, it kept fading away through the entire performance. She was on fire and i'm glad we got to see Xtina the fierce performer she spoiled us, her fans with.
She looked good, stage presence was great (probably her best in years), but the sound was pretty bad. Maybe it was the mic. But to be honest, I also think she didn't do very good at some of the high notes. It happens.