Yes some samsung devices can do this with out any app.
But at the time I was researching this my old samsung tablet does not have this feature and I wanted to test it to see if maybe it could be an alternative to buying a new one. But I was using Reference images on nomad a lot and I really wanted to have more screen space, that is why I got a new one bicose of screen rellstate but it worked fantastically well.
I have seen video comparison of the lags each one has and Superdisplay when conected through cable, has none. You can use it with Wi-Fi too, It works well if the signal is strong but what happened to me is that sometimes it disconnected and is quite annoying but with cable is just fantastic.
Now I have a new samsung tablet that has the samsung option so next time I would need to connect it with the pc I will try to compare them.
Here one of the videos I saw: 3 method explained, the ones we discused here and a third one and how to set up each of them.
And you can see the results on his set upp. Probably some people may benefit more some over the others depending on their particular set up.
