It scales very well with gear due to the passive Agility bonus and the base 20% damage modifier. Also, with the gear in 5.2 it may have great potential as the SND mastery will scale very well with the legendary meta and RPPM trinkets. Blizzard said in a blog pre-5.2 that it was concerned about very high damage from Sub Rogues and Enh Shamans in high end gear.
Has anyone tried Sub in raids?
Would be particularly interested to hear from people with the above items (legendary meta and RPPM trinkets).