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It's also why we can work with almost any modern android device. Only USB-OTG support is needed.

Doesn't that mean that there are serious limitations when it comes to 3d games or video watching on the bigger screen ?

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.

DisplayLink is pretty neat and supports the one-cable solution really well; but can you share some of the thought process behind choosing it versus MHL (the old, USB-micro-B one) or one of the new USB-C alt modes (DP or new MHL)?

How's performance with this approach? Can it push the 1080p display at 60Hz?

Great question - and spot on in your assessment. The answer right now is not always on 1080p at 60Hz depending on what's happening on the phone, but generally not noticeable to the user.