I spent a few hours listening to them using my GS-X amp.
Very impressive detail resolution. Treble is prominent, but not very fatguiing. Bass is good; not particularly impactful, but good-enough.
Vocals sound appealing, but not quite right in my opinion. The timbre is too high, a little thin (lacking body), and somewhat unnatural. Noticeably different from my references (SR-009/KGSS, Focal studio monitors) which have more convincing vocals. The W3000 have a tendency to make adult vocals sound like teenage vocals... Also, significantly more sibilance on the W3000.
The W3000 are indeed quite a bit better than the W5000 - less thin sounding, better bass. Still, orchestral music lacks some body.
Soundstage is quite limited.
They fit my head fine, and look very nice.