It me! If you want know anything about the the 5K from a non-audiophile point of view (usability, features, and comparisons to my old ES100, bugs, or annoyances), I should be able to quickly check and comment. I'm not a pro, so can't really comment on audio quality though . It's comparable to the ES100, if that's enough of a reference point.
As far as the mic, I just came back from a long walk, and it's pretty neat and very clearly picked up my voice and rejected background noise. I did a few real and The Test Call calls and they worked out just fine and rejected most road/wind noise, especially while I was speaking. When I first got the device yesterday, I did a few test calls in the house while a radio was playing in the background. The radio was completely rejected and my voice was loud and clear. At least compared to the ES100, this is a major difference and makes it practical for me to take calls directly on the 5K without taking out my phone.
Just note that although there is a sideband mode that mixes your voice with phone audio during a call, this only works during a call. There is ambient mode (no way to mix outside sounds with device audio). I have a feeling that the noise cancellation would make such a mode less useful as the audio from the mic is pretty clean...it's literally just voices speaking directly into the device.
That's the scoop on the mic. Kinda wish this was out when I settled on the ES100, but just had to grab it, and then I just had to grab this when it was released . I guess the spending stops now until the next random wireless DAC comes out.
Great news on the mic! That was one of the things I do not like about the ES100 and some of my true wireless buds...call quality is terrible. Currently have to switch to my SE425s for calls bc it is the only IEM I have that has a cable with an Inline mic.