Mine is coming within next two days. From what my friends told me about their impressions...i am guessing this m100 is not that suitable for vocal jazz kinda songs which reguired better clarity and accuracy. But this m100 has a very good bass and enough detail to perform other genres. Can't wait to try them my self. I would expect is a good for all rounder.
They may surprise you in a good way with jazz vocals as well.