Got my RoCoo P today! So excited. Because of some problems with shipping and getting my information, HiSound included a pair of HiPhone 4 IEM's along with the PAA-1s that come standard with the RoCoo P. Haven't had a chance to listen to them critically yet.
Anyways, I charged the RoCoo up to full capacity after about 2 1/2 hours and loaded it up with some FLAC.
Out of the box, I can definitely tell a difference between the RoCoo and my iPhone 4 soundstage wise. On live tracks, I feel as though I'm positioned between the crowed and the vocalist with the RoCoo. I hear the crowed blaring right behind me as Dave Matthews chimes in, clear and crisp. When listening to the iPhone 4, i feel slightly more cramped, like I'm in the middle of the crowd and Dave is stuck there with me. Less instrument seperation and not quite as wide of a presentation with the iPhone, I would say. One thing that I found interested is that some instruments come out through the left channel on the RoCoo that come out the right channel on the iPhone 4. I actually prefer the leftword sound, but that is completely subjective. Just something to keep in mind, I guess.
I read some posts saying that people heard significant improvement in the extension of the highs after the RoCoo had burned in, so I'll see how that goes after some play time.
Overall, I'm very happy with the RoCoo. Thanks to Jack for getting everything squared away for me.
Oh and on a side note, I used ATH M50s to do my short comparison.