Worth paying for this higher qualtiy 13 pin connector cable
Not all 13 pin connectors are created equal. I have had recent failures of these cables when sourced elsewhere and for less money. This time I bought a more expensive version, and this one seems made from better materials (the connector doesn't give me an argument when I slide it in and out of my GK-3), and the cable itself seems of higher quality than others I have had which didn't last (the cheaper ones start to produce static noise after a few weeks of moving around with the cable connected). Some of the better quality cables I have had have lasted several years, rather than a few weeks, and of course there's no predicting how long this one will endure, but it just feels promising. I firmly believe you get what you pay for.
Although far more rigid than the original GKC 13-Pin cable that came with my GR-30, it seems sturdy. It doesn't really lay flat and it curls up into loops making it a tripping hazard, but I don't see it waring out any time soon.