The brainchild of possibly the world's best guitarist (just watch some videos of him on Youtube), Tosin Abasi, alongside fellow guitarist Javier Reyes, they (I think) push the boundaries of the sounds that guitars can make. Equally, drummer Navene Koperweis is simply brilliant. There are so many variations in time signatures (which I understand remarkably little of, for a bassist), in sounds and styles, they are simply one of the best bands out there. Did I mention they're entirely instrumental, so no vocals to get in the way of stellar guitar work? 16 strings, some skins and some synths, it's amazing.
Don't be put off my the inclusion of the word 'metal' in my description, many of their songs are softer and contain some quite beautiful melodies; listen to Behaving Badly or On Impulse from their debut self-titled LP which is a superb album. Their second, Weightless, is also excellent but I don't think it's quite on the same level as their first.
UPDATE: I forgot about their upcoming European support slot with Meshuggah! Hopefully I'm gonna be at the Waterfront in Norwich to see them, let me know if you're there!