fwiw that is a "real" microphone and *not* one of their single-point stereo deals like the ecm-719. They say right there that it's got "excellent sound quality," so what else do you need to know?
Nick, it looks like they've only got two left, so blow a couple grand and let us know.
On a more serious note, I found a couple videos with the 100U in studio settings, which while not field taping, at least lets you hear that they are not bad mics.
https://www.youtube.com/watch?v=oznSyDz8a9kThis one goes back and forth between a few mics, and in both mono/stereo, plus its chaptered with the mic names so you can seek around. Importantly, the other mics used *are* mics folks have taped with so you can try and compare them by finding LMA recordings of the other mics and know that you'll at least end up with something comparable.
https://www.youtube.com/watch?v=_WyqpE6PK88 Also includes the 100N omni and another set of Sony mics.
Also, if you *do* decide you want to try them out, Sweetwater has them as a special order for a couple hundred less per mic than direct from Sony.
https://www.sweetwater.com/store/detail/ECM100U--sony-ecm-100u-small-diaphragm-condenser-microphone