As far as the band goes, very well put together, impressive prog-metal. I used to be a big DT head, which got a little old purely due to the level of virtuosity, and sort of got desensitized to it, and James is a terrible singer.
Granted their more recent albums have been pretty abstract, but after listening to them a few times through i could understand why what was played. That and their live performances are flawless, which goes a long way in my book.
As i said before, definitely worth mention and a listen. They did just release a new album (the great misdirect) and i'd say the "single" (which doesn't exist in prog-metal) would be 'obfuscation'. Can't say how many times i've listened to that song.