I like their work. They're ambient, with long dragging vocals, seeming to carry you off somewhere, a better place.
Anyway, I can't really say if the music has ether or not. I think that's subjective. Music affects people differently.
Someone may get pumped up by Iron Maiden, while someone else might just be disgusted, or doesn't even care about the song.
But yeah, Sigur Ros is definitely worth having to listen to. It's good music, and the music video is pretty neeto too.
here's one with people with downs syndrome. you can hate it, you can love it. But read the comments, they say it better than I can.
http://www.youtube.com/watch?v=Xow2gnVTUjs&feature=related