They can shred pretty hard. I thought Mastodon was better but then again I'd never heard any Dethklok. Mermaider or whatever was pretty awesome. They got this huge screen behind them that they play clips from the show on. The most annoying part of Dethkloks performance was that they had these little clips from the show inbetween some of the songs. And it was hot as fuck where I was standing. Also, the people in Dethklok look nothing like their tv characters.