By chance I found this manufacturer on Amazon and had at this low price no expectations. I figured already established with an exchange. But lo and behold, the film remains at the corners of the S6 edge liable and is relatively easy to install.
So to me, there is a strong buy recommendation! Especially for the most competitive price will be probably find no comparable full cover protector.
Conclusion: Cheap is not always inferior, as is evident in this case.