I always use either Neutrik or Amphenol connectors when making my own cables. The quality is first-rate and the dealing with the hassle of bad connectors isn't worth saving a few € in my book. However, these look so much like Neutriks and are so much cheaper that I bought a few to try them out.
Cosmetically, they really are shameless clones: unless you look closely you won't notice the difference. But they aren't the quite the same. I accidentally snapped one of the plastic cable-grippers which appears to be made from quite brittle plastic. I have never done that with one of the premium brands. They also don't seem to fit quite at tightly as the more expensive ones.
That said, they are very much cheaper than the branded ones and they aren't at all bad. I probably wouldn't trust them on a cable that was going to be plugged in and out a lot or was going to be subjected to lots of movement or strain, but for fairly static applications they are more than good enough.