This is the set that I have as well (E2C). They're great for travelling and I can easily leave my noise cancelling Sonys at home nowadays for lighter packing. Although, after 3+ hours, I find that my ears get irritated... I think I might look into using the foam inserts for a while in the future instead of the plastic inserts. But I'm not sure how good it'll sound compared to the normal plasic gels.

What's the big difference (aside from price) to jump to the E5C?