So, I'll compare my needs to a IEM, a Westone um3x, due to the fact that I never had a headphone worth mentioning =p.
I need something easy(kinda of) to drive, as my main source will be my PC with a Creative X-fi.
What I feel like I'm missing from my UM3X:
- More bass, quantity/impact;
- I miss a little more highs, but actually, I only miss on classical music(violin, piano);
- And a wider sound-stage;
I wish to keep:
- The mids;