Sigur Ros and Explosions are both awesome, and music isn't a zero-sum game. BT's This Binary Universe does the everything better than Sigur Ros, so buy that instead.
I'm glad I saw this. I only have Suddenly I Miss Everyone and Earth is Not a Cold Dead Place (I like the former more), but yeah, good shit. It's definitely up there on my summertime listening rotation with Bullion's Pet Sounds (In The Key of Dee)