This is the first active Thunderbolt cable I've been able to use with a Thunderbolt dock that I haven't had intermittent video problems and loss of connectivity. I am using a Lenovo Thunderbolt 3 Gen Dock. 2 and tested with several different laptops - ThinkPad X1 Yoga Gen 2, ThinkPad X1 Yoga Gen 6 and Dell Latitude 7390 2-in-1. Previously the longest cables I could get to work properly were 0.8m Apple TB3 and 0.7m Lenovo TB3. Several active cables I've tried have given me problems. After seeing the DisplayPort compatibility notes on this TB4 cable, my curiosity peaked, so I decided to give it a try. I haven't tried this cable in a configuration where it connects directly to TB peripherals like monitors, but I suspect the data transfer and power requirements for the dock will be just as great.