While they are sensitive enough to get volume from a portable, as soon as the music becomes in the least complex, you'll hear the soundstage collapse and the sound become congested. Listening at quieter volumes though it may not be so noticeable. Volume makes a considerable difference in the perception of headphones, as does the music being played.
ag8908: I hope you get a chance to try them with a better amp than straight out of your phone.
Collapsing sound stage and congested sound ? is this with respect to cheap portable amp ? or overall impression of LCDXC ? This is not very good news