Here are my two cents worth for my findings with my IM70 >50hrs at least.
Bass: Slams hard and very physical, not overblown and does not obscure the mids.
Mids: Very nice, sounds correct to say the least
Treble: rough, it is not the strong point of this IEM to say the least. Lacks air.
Soundstage: Very closed sounding to me compared to say, a CK100
Detail: Not a particularly revealing IEM but clear sounding enough for me, greyish blackground that does not work well...