Went back to target today and after much ado exchanged the she 8000's for a pair of purple 3590's (apparently the succesor to the 3580's)
My god these are small. Insertion and seal are a little problematic here. I finally went to the much hated (by me) triflange which fits better than the large tips but does thin the Bass a little. I see much experimentation to be done here.
What I am hearing is a fairly neutral sound sig with a little enhancement in the top end. I suspect the Flanges have rolled off the Bass a little. Right now listening to Counting Crows Omaha, I can hear the drum strikes so well I can see the stick marks on the skin. At the high end cymbals are just at the limit of brightness a little further and it would become shrill. Bass guitar good enough to hear each string plucked.
Separation on these is just lovely. Imaging narrowed with the tri flange so that is something I need to work on here.
Next up more listening tests with different amps. My suspicion is that these will respond very well to an amp.