Clarity

Just to quickly explain in case there was any confusion in the previous post; I would only recommend using the Deadened Nerves spec in Zon'ozz heroic and Ultraxion reg/heroic, due to the inability to backstab throughout the entire fight on Ultraxion, and due to the inability to stay behind Zon'ozz during black (for group heals and survivability). That spec will however help greatly if you are staying Assassination since it gives you an extra 10% damage reduction and +20% healing recieved, the other option would be of course to have one of your specs be Combat. If you have a second set of gear with forging to haste/expertise (if not capped or close) Combat dual would be smart to use.

-Ochiru