two things immediately come to mind.
1/AMAZING VOICE: Tom sings seemingly effortlessly during the whole concert, hitting all the high notes. Overall, you get the feeling that his live performance is better than his studio performance. His voice is powerful, yet pure, effortless, and very melodic.
2/WHAT A NICE BUNCH OF GUYS: This is s band that sold millions of records worldwide. Their popularity is even bigger in Europe. Yet, my friend and I got pictures and autographs from 3 of the band members. These guys are friendly, humble, and patient (they took the time to stay out in the cold after the concert to make sure all the fans who were waiting were satisfied).