I saw these guys at Rock on the Range a couple years ago, and really enjoyed them. Maybe because I've played the cello since 4th grade? I go to classical concerts all the time and love 'em.
I will say it pissed me off how they play standing up. Do you realize how fucking SHITTY your posture is for playing cello standing up? It's just stupid. A gimmick. If they were serious musicians about it, they would sit down and play well.