Got the ATH-CHX7iS at Yodobashi Osaka about a week ago since I was looking for something to use while running.
I was a little surprised at their size. Here's me wearing them: http://imgur.com/94oRMIx
In terms of the sound signature, it's on the warm side but not overly so. There's roll off on both ends, making the sound sort of mid-centric but it doesn't give the impression that it lacks bass. The KSC75 and Sportapro have deeper bass, but that's to be expected given the driver size. As least it's well-controlled. The soundstage isn't overly wide, but there's a decent impression of depth although frequencies apart from the midrange do get a little fuzzy. No painful treble spikes either like the SJ55.
I love the tips though! They do a great job sticking in my ears while running, and there's little to no cable noise. They also keep sweat from getting in the drivers. The cable is nice too, being flat and with little ridges similar to the Sony C10ip. I'd rather have a full 3-button volume control though instead of a volume slider and one-button mic control.
Compared to the ATH-CKM500, the CKM500 has significantly more bass, and the CHX7iS sounds more open. The treble quality is more of less the same. Sound isolation on the CHX7 is non-existent, which in my case is good because I don't want to be deaf while running out in the open.
Again, despite my criticisms, they don't suck and are decent for the prize. They're good at what they do and the build quality is pretty good. In terms of their stock sound, I like these better than ibuds which tend to be overly warm in stock form.
Thanks for the impressions!
how the vocals sound?