Boom (gooseneck) Vs ambiance microphone

Hi,

I saw a glider recently with a "ambiance" microphone installed in the
instrument panel (facing the pilot, it only takes a small hole in the
instrument panel).

I was wondering how this performed compared to what we're used to = goosneck
microphone on the cockpit side.
I like the idea, it's saving space, and you have one thing less in the way
when getting in/out of the glider.

Has anyone been using an ambiance microphone in the instrument panel (or
somewhere else) ?
Any etra noise ? How does it perform ? Is that acceptable ? Can others hear
you correctly ?
Do you have to shout or speak normally ?

Regards,
Ludovic