Well, the FedEx guy stopped by today and I've got B100 in my ears right now. Listening to Eagles out of LPG. Reading over
@HiFiChris's description above made me laugh a bit because I asked if they could please send me the warmer pair but looks like that didn't pan out. Oh well...
They're smaller and more comfortable than I thought they'd be from the pictures. I was a bit worried the edge just behind the cable entry would dig into my ear, but that isn't happening at all. The ear guides are small and formed just right for my ears. Glasses wearers should be happy with these!
Isolation is very good for me with the stock medium tips. I'm going to try the small tips later with deeper insertion and see which I prefer. Microphonics are minimal.
Sound is good. Better than I thought it'd be, honestly. Just on the warmer side of neutral. Soundstage is pretty good. Sibilance is well under control, which is very welcome.
I've got a few other single-BA IEM to put these up against in the near future. Should be fun!