Haven't had a chance to crank this up to 4K yet, only 1080p but it worked well enough. I can sometimes notice a lag on the display, but that's to be expected with a USB display. My biggest complaint is that the picture drops out for a second every now and then. I'm not sure what's causing this (perhaps the laptop isn't keeping up as it normally does when the laptop is under load), but the interrupt is transient and doesn't happen all the time, so it's not that big of a deal thing for me. Overall I give it a 5 star rating as it has done pretty much everything I have asked of it so far. Running Windows 10 on a Dell laptop with proprietary Radeon graphics and 7th Gen I7 processor.
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