On Jhazmyne's Lullabye, the vocals are deep husky roar. They do the typical switch between heavy breaks and great melodic sections, but they do it so well and it sounds effortless. They'll transition into a chugging breakdown and then right into a subtley technical run (read: not masturbatory) and they'll do it all with a hint of melody. They were really pushing the bounds of melodic hardcore along with .Hopesfall., Skycamefalling, and the like. They're pretty creative with using harmonics, something the guys would expand upon in Misery Signals.
They really were ahead of their time especially when you hear the influence they had on a lot of bands after them (This Runs Through, Enlow, A Jealousy Issue, etc.).
I uploaded a track for you:
http://s5.yousendit.com/d.aspx?id=1TT843RUUH0CU26WO6EL3NQF4J