I'm looking at the description for Dazing Assault. It is not clear to me if it Dazes on a successful combat maneuver using a weapon, like Trip or Sunder?
I'm leaning towards that combat maneuvers won't daze with it....although I wonder if you have Greater Sunder and then do some damage to the opponent with it, would it daze?
You can choose to take a –5 penalty on all melee attack rolls and combat maneuver checks to daze opponents you hit with your melee attacks for 1 round, in addition to the normal damage dealt by the attack. A successful Fortitude save negates the effect. The DC of this save is 10 + your base attack bonus. You must choose to use this feat before making the attack roll, and its effects last until your next turn.
Are either trip or sunder a melee attack? No. They are combat maneuvers. Only opponents you hit with melee attacks have to save against being dazed. The feat says that you do, however take -5 to both melee attacks and combat maneuvers for the round in which you are attempting a dazing assault.