yes, the hiss is quite a lot, I can hear big hiss of zx1, small hiss of ipc and no hiss of iphone5, and as you said in the vedio, it's very loose to pull out the plug, so yesterday I tried to do some work out with listening to zx1, the plug is not stable in zx1, it's like 36 size feet inside 38 shoes. and the sound too, I have to keep zx1 in stable environment to listen to, can't listen to it when doing sports or moving too quick, The sound will just shut down and up and down and up again and again even I stopped moving. And today I found I can't even slow walk with zx1 in pocket, the sound will get unstable too. ( update, it's in third party player app, the origninal play could be ok while slow walking, but will try to do sports later)