Hi Martin

> Hi. Do you think that the zipper noise is impossible to live with Is
> it really bad do you think

You won't recognize it, if you have bright and vivid sounds and if the
sound is embedded in a full playback. But if the sound is more dark,
like a triangle waveform, and there is no other sound around, you might
hear faster control movements. Slow control changes are usually not
hearable. (Its like with the zipper on a jacket: if you close it slow,
you won't hear it; if you close it fast you will hear the typical
rrriiizzzz...)

> Maybe I shouldn´t even open them when they arrive, so returning them
> is 100% safe...

You don't have to return them unopened. It is the sense of the law, that
you can test the good you are buying as you would do if you are buying
in a real shop.
Unpack it.
Don't throw away the package and the filling material.
Test it.
And if you don't like it, send it back.

The price looks cool, and I already thought about getting some of them.

Florian