Picture: I have found no artifacts or dropouts, the image has always been properly (Blu-rays with 1080 24p & PS4 1080 60p).
Sound: Since I have no surround sound system with HDMI input, I can only say that stereo sound works on the television without any problems.
Quality processing: The cable is very well made and has a very high quality. The plugs are very well made and gilded. The cable is quite thick, which due to the shielding is necessary even at this length.
Conclusion: In short, it works. Especially the price of a 7.5m cable (currently about 13) is very fair.