just to add fuel to the fire:
while i do enjoy these earbuds, i believe firmly that these are NOT retail EC7's. i've been looking at wholesale prices for EC7's and the wholesale price is still ~$30-60 per pair. These are selling for much less than the wholesale price.
i do not have a hard time believing, however, that these may be factory seconds/rejects/whatever that didn't make the cut to retail quality (perhaps because the metal-work on these are NOT flawless). that, or these are simply knockoffs (though I tend to think are too good to be knockoffs IMO). sound-wise, I can't comment because I don't have experience with "real" retail-quality EC7's.
impressions:
I've been listening to these out of my ipod mini for the past ~2hrs. Sound seems to have improved overall: they are becoming more refined to my ears. These do not have the clarity nor detail that I was hoping to achieve, and the lows sound very muddy. However, note that I have not put the foams on them, and things may change as the fit improves. IMHO, these are no match for the ksc75, but the comparison may be unfair because the koss is really a full-sized driver enclosed in a clip-on shell. Overall, I'm happy with the SQ considering what I paid (~$23 shipped) because these probably beat whatever's available in the stores in the ~$20 range. If the "real" EC7's sound like these, however, I'd feel pretty ripped off.
final thought:
I'm moderately happy with this purchase. I was skeptical at first mainly because OP was a new member with his first post being the start of this thread. It looked too much like shady advertising. To clear things up, I decided to bite the bullet and give these a shot. I think at least one other member besides myself and the OP ended up happy with this purchase. (Happy, at least, until the unit fails over time!) YMMV