As a fan of Clutch for over 15 years, I admit to be somewhat bias here...
Anyone who has followed Clutch for a while probably knows them to be about the most gimmick free and true to roots rock and roll band of today. They progress with each album and keep fresh with original and intelligent lyrics.
On stage they're remarkable. For starters, Clutch's guitarist, Tim Sult, plays the entire set for the opening act, Lionize, before taking the stage with the big act. These guys are truly professional and journeymen of live shows. Neil Fallon's voice was crisp, the band played as tight as one could hope, and the mix was spot on.
Some fellow concert goers showed disappointment in the encore. They didn't play classic tracks of theirs like Shogun Named Marcus, Big News or Texan Book of the Dead. This didn't bother me a bit. They have around 10 or 11 LP's, several EP's, and have never been single oriented. I figure after doing this for close to 20 years, they probably aren't that interested in playing 15 minute versions of Spacegrass anymore. Besides, the true fans would be fine with more obscure songs like closing with The House that Peterbilt, which they did one night earlier in Calgary.
For anyone who knows them and doesn't mind them, just go. There's a great vibe in the crowd and the band won't disappoint. For those who know them well...you know the drill...