I don't think folks are saying that the Sensaphonics is bad but at the same time as I initially posed last week, from the Sensaphonics folks here in Japan themselves, they're cautious to make a statement that it'll be positive effect for all KSE1500 owners for the very reason
@goodvibes
has eloquently put.
So in other words for the rest of the KSE1500 owners here, is as with all other recommendations here on Head-Fi, to proceed with caution. Just because it works for some folks doesn't mean it works for all.
I can feel two cables inside the sleeve and at least in mine, the sleeve is reasonably loose enough where I can "rotate" so that the whole cable doesn't look twisted. I roll up the cable with 3 fingers so therefore tight but not too much that would damage the cable. I've had solid-core cables before of which are prone to damage easily.