To me the parterre was clearly mid-centric, with a marked effect of the titanium shell on the soundstage. The construction is meant to enhance acoustic music, but to me it was a bit shouty and the soundstage too narrow. I still have the prototype, but unfortunately it died on me quite quickly after I received it. Suyama san offered to have it fixed, but I didn't really care for it from what I had heard.
Anyway, to each his own, and I am sure it works for some people. It's still a FitEAR, so top notch construction and attention to details.