Absolutely horrible and frustrating! Advertised as being able to handle 4 separate 4k monitors, but it will only do high resolution on one. I spent hours with my firm's IT department trying to get the resolution to match on 2 HP Z27 monitors and it will not work.
Used with an Omen 17. It had several weird issues initially, particularly with USB. They were resolved with a firmware update. There is no automatic update, you must find/download/install them manually. That should be automatic with a new device! After that, however, it has been great. I am not (yet) stressing it with more than one 4K display, but expect to soon. I guess I will need to manually check for updates in the future too since it isn't automatic.
As with the dock that I had previously on the EliteBook from 2018, the connected monitors will turn to black for a few seconds every once in a while. With my old dock, this was eventually fixed with a patch, but it was frustrating that it didn't work out of the box. The new dock has the same issue, which is remarkable to say the least.
Works great on my Z-Book. I would give it 5 stars if it that a headphone jack (I had to purchase new USB speakers). The power button on the dock starts the computer every time. In 2 weeks of use, it has been flawless powering 4 HD monitors (one is USB3)