Yes totally for 3D games. We see the Superbook as more of a productivity tool. You would most likely still play your games on your phone. But for video watching, no. There's virtually no lag. See our Surface demo to get a sense of how well it works: https://vimeo.com/176370847

Btw because we use DisplayLink, you can also use the Superbook as a secondary monitor / keyboard / mouse for windows tablet,s laptops, and PC sticks.