Obviously, however, there is evidence of serious Fertgungstoleranzen just in this optical cable with respect to the plug.
When connecting to my Harman Kardon AV receiver anyway the plug does not fit right away, and after a little more pressure, I shot up to me as a result the jack on the receiver.
Yes, I have before the small plastic caps away!
Yes, I have the plug inserted in the correct direction!
No, I have not soldered the connector (as some Vollpfosten have commented here)!
A Clicktronic cable as well as one of Hama Vivanco and fit properly.
Conclusion: not all bad (a lot of positive experiences), but apparently but fluctuations in production (some serious negative experience).