These cables turned out to be of good quality, unfortunately I had to return them as they are not compatible with Cisco devices. I don't think it's a physical compatibility issue, it's an issue with the validation Cisco devices do before they work with the cable. There is some sort of microcontroller built into the cable that will return some information about the certification of the cable. Of course, Cisco will not use cables that do not have specific certifications. So I can't say if the cable works well with other devices, it just doesn't work with the Cisco switches I've tried.
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