Finally decided to pick up a pair of these as my Creative EP-630s are no longer serviceable.
I'm mainly a headphones guy (only other IEMs I have are the Triple-Fis), but needed some decent earphones/IEMs to use during commute, and decided to try these based on popular feedback. Picked up a pair of SHE3580s (they had the 3590s too, but figured I might as well get the exact one that's been lauded so highly on here.)
And frankly, I've been very disappointed thus far.
Was expecting the SHE3580s to pleasantly surprise me, if not wow me over like it has for other users in this thread.
The EP-630s were a nice pair that were to me, fairly average across the board, which made them perfect beater earphones for use around the city. It never really shined at any one part, whether it was treble, bass, vocals, or instrumentals, but everything was "good enough" that it never really bothered me.
The SHE3580s on the other hand, right out of the box, was rather unflattering. The construction of the actual set is rather solid, except the headphone jack seems to be rather picky with my iPod, and simply twisting it the wrong way kills one of the channels.
Musically, the SHE3580s simply murdered my vocal tracks. Songs that have female vocalists with bright, strong, arias now had tinny, wavering ditties. Though I don't think anyone in this thread has yet complimented the SHE3580s on their suitability with vocals, so I was more accepting of that.
However, one thing I did notice people expressed was regarding strength of the bass and it's energy. So I loaded up some songs with plenty of bass... nothing. The bass was clear, that much was for sure. But completely devoid of any punch or energy whatsoever. I even loaded some dubstep to see if it wasn't just the quality of the bass in the song... but one has to admit something's amiss when even the "great" wubwubs can't really push through.
Though I did find some positives in the SHE3580s. Resolution was very good. I definitely was able to hear more detail from them than the EP-630s, which pleasantly surprised me. And while the sounds were weak and colorless, they were not without clarity. None of my songs sounded muffled or overblown, which I appreciated.
After my initial disappointment, I tried fiddling around with the EQ and adapted settings similar to what Joe Bloggs suggested. While it did improve the sound somewhat, it was still a far cry from what I was expecting when I first put on these earphones.
Hopefully my problems are just a matter of burn-in, or perhaps of user error, but as it stands, I am unfortunately not able to be as enthusiastic about these earphones as others are.