Appears to work as advertised, but I don't have a 4k TV yet, just regular 1080p. One interesting 'glitch': I usually run an hdmi from my DVD player to the sound system receiver, and then an hdmi to the TV. I initially used this cable between the receiver and the TV, but it did not work. When I used the cable from the DVD player directly to the TV, it worked fine. Of course, in that configuration, I don't have surround sound. I'm assuming that either my receiver is too old (Denon AVR 2313CI) or that using a regular hdmi to connect the DVD to the receiver is incompatible with this cable.

This cable works great! I tried many, many long HDMI cables and this was the only one that could pass a 4K signal at 60hz.