@ MadSci:
Yes, I find them comfortable. They can be a bit tricky to put on at first, but once you get the knack it's fine.
Sound quality is excellent, both for the music and for calls whilst they're on. I don't know how they do it but the mic in the headset works
fine; I've never had a caller say they can't hear me.
Couple more things: the controls (Volume, Next Track, Pause, etc) are touch sensitive buttons (not Mechanical ones) and they can be tricky to press correctly.
As before though, once you get the hang of it, no problemo.
The Moto S9s can be tricky to wear if you wear specs. Sequence is... Specs off, Headset on, Specs on. Also if you are lounging or lying down with these on, you may have to
re-position then headset a bit to get comfortable.
Given all the above, I really do recommend these, Good sound, Slick design and you don't look like Flash Gordon's Co-pilot when your wearing 'em.
Hope this helps