Cool!
I agree with you about the tearing, it's very frustrating and it almost kills all the interest of buying an XU4.
But in a way you are lucky, because a few months ago we were all still dealing with another big issue that we called the "black screen issue", basically almost every-time you were exiting a fullscreen application, the XU4 was freezing with a black screen and you had to restart it ! And I think this bug was there since the XU3 release date (during 2014)!!! At least this bug is fixed now, hopefully the tearing issue will be fixed soon too.