Disclaimer: This headphone is one of whooping 18 loan pairs generously provided by Rick. I can't describe how grateful I am..
CON: The treble is slightly sibiliant. Unlike what Foster claim with their bio-cellulose driver technology, the level of harmonic distortion is enormous in the frequency range below 100 Hz, especially with a lot of odd-order harmonic components; However, depending on a personal preference, such distortion may contribute to enhancement of the perceived bass quality (Or not).
ON SECOND THOUGHT #2: Sooner or later, I'll obtain my own pair of Live!, since I see a good chance for modification with this headphone.