Exmortus: Ride Forth
LA thrashers balance musicianship and mosh
The thing with gifted extreme metal musicians is that you never quite know what to expect from the songwriting.
There have been great examples of the subgenre, like Atheist and Believer, as well as many less sterling ones. Happily, Exmortus stride the line between ability and masturbation rather well, rarely allowing their technical impulses to career out of control.