Because I am a glutton for punishment, I keep buying KZ IEMs. I have way to many of them now, and all of them save one, sit in a drawer in my bedroom. The KZ ZS10 Pro is the only KZ IEM I would consider recommending. They finally got the tuning right. Well extended (sub) bass, no bloated mid bass hump, thick and detailed mids, and detailed treble that flirts with the edge of to much but almost never crosses it (foam tips tame it as well). These are a great buy at $40.