Im using one of these to link my RME Fireface to my desk (Allen and Heath zed436) in my studio. The cable itself is well made, however, fairly heavy, so have it supported by something or the weight may pull the smaller individual cables out of the jacks.
The jack connectors themselves are decent, not on a level with neutrik, but not terrible. The breakout wires for the individual jacks are thin so be careful. They are also individually labelled, for ease of use. Yes the connectors can unscrew fairly easily, but they are not flimsy. Having 16 jacks in 1 loom is also very helpful.
In typical Thomann style, these are excellent value for money. Decent quality, while not extremely high end, are way beyond what you might expect at these pricepoints.
Overall, for the price, im really happy. To replace that with high end cables and neutrik connectors would costs many times the price of this.