The product works perfectly. Tested my DELL laptop connected to 4k TV: 4k @ 60Hz, no problem at all. The 60Hz makes much more usable the laptop (no more lags affecting mouse precision). This is the only way to have 60Hz with laptops that have an old 30Hz@4k hdmi but have also a more performing miniDP. Obviously the integrated graphic card shall support 60Hz in 4k resolution.