I don't see why these guys don't already have a thread about them on here. Their music is genius and they put on one hell of a show. Their most current album Tree of Tongues far surpasses their past effort I Have Made My Bed In Darkness which in itself was ground breaking in my opinion. Tree of Tongues shows a more matured, better structured sound while still maintaining that sound of insanity.
They just finished a tour with Arsonist get all the Girls and are (edit) playing a few stops on BoyHitsCars "Embrace the Fire" tour.
Check out their Audio Tree Live session in the replies.