I bought about 20 of these in various lengths 9 months ago, mostly 6m and 10m, trusting in Thomann's usual good value for money products.
First red flag was that they came squished into oblong shapes from the factory packaging, meaning they wouldn't coil properly. I had to squish them the other way with pvc tape and leave them for a few days to try to get them to take a round-er shape (which sort-of worked).
Other than this they looked like quality cables and well put together.
After 2-3 gigs however, they started breaking. Specifically, the female connectors gave me the standard 'dodgy lead' distorted sound, especially when used on vibrating sources - specifically on drums. Soundcheck would be fine, but mid-show at least one would give up and I'd have to run on stage to change cables mid-show.
Nothing wrong with the soldering connections - btw the heat shrink is a nice touch, acting like extra strain relief; it's the connector itself that is not robust enough and keeps breaking. I keep replacing the female connectors, as soon as they break, with Amphenol connectors and most of these cables that I've bought now have Amphenol female connectors. Stay away from these unless you plan on replacing all connectors from the get go.