I'm looking to add another great iem to my collection. I currently have TripleFi 10 & GR07. My favorite music varies between Dubstep, Psy Trance, Vocal Trance to Classical and Jazz. My favorite areas of a sound signature are sub bass and sparkly highs with a pretty wide soundstage.
The Z5 is definitely out of my price range, but would the Sony XBA A3's be what I'm looking for?
So going back to your question, yes the A3 strengths are its sub bass and far reaching highs as well as a pretty decently wide soundstage. $300 is a very justified price for them, I havent heard the tf10s before but the A3 is definitely a worthy upgrade over the mighty gr07s.