Mic quality compared to the ES100?
How is the mic quality compared to the old ES 100? The ambient mode on the ES100 was a really cool feature, but ultimately pretty worthless since the sound was really bad.

Maybe both the mic and new SoC will improve things? 
5K would provide a better microphone quality for voice calls.
We designed the system with a very high sensitivity MEMS microphone.
However, it's mainly for voice calls, anyway.
The pass-through mode is just mixing the mic input and streaming audio. It's just for checking-in the outside noise.
We appreciate your kind understanding.