Disclaimer: Thanx to my friend, vAsurada, I am having another shot at this funky headphone.
CON: It is extremely hard to find a comfortable fit that yields good bass. An ear guide that tightens the coupling would have been a great help. The distortion figure is gross in the lower frequency range.
my good friend, Salsal.
ON SECOND THOUGHT #4: While the above diffuse-field referenced data is still valid for binaural reproduction for its directional properties, PFR-V1's frontal localization characteristic indicates that the reference is not an adequate target for representing the headphone's true orthotelephonic gain, or its localization characteristics.
Continued to part 3, in-depth analysis.