Sony PCM-D100 vs 3Dio vs Neumann for Recording Difference in system changes

Hello,

I was contemplating purchasing a Sony PCM-D100 to record differences in my personal stereo system.  Essentially so I could quickly switch between recordings and listen to a high quality recording of how my system changed.  I've also contemplated using a 3Dio or Neumann binaural microphone as well.  

Possible phase 2 to share the audio recordings with others to see what they think between the sound.  Seems like more people are doing reviews on youtube and sharing results.  

Wondering if anyone has any experience with this and with the Sony PCM-D100. 

Thank you!