I own tne 27 before to drive PRO AC responce 2,it has plenty of details , fast and clean,very much like my existing CELLO 350,although the sound stage is not as open as the new MARK,but you won't be regret to us with it,compare to 29,it has more solid mid and lower bass,dynamic is awesome,and mark signature's sounding,clean and clear.
Happy listening.
Happy listening.