For the Hardware Unboxed RIS video the tl;dw is that they're very impressed with the result when downscaling a 4k to around 1700-1800p and applying the sharpening filter. In many cases the result was equal to or better than DLSS in several titles with basically no perf loss. Especially when it can be applied to any game immediately rather than having integration by developers then weeks/months of training.
No discussion in video about affect on UI or other aspects of the game and obviously more in-depth analysis by several parties is needed.
Since AMD is giving away the algorithm for free, I'm hoping most games will implement it directly with adjustable sharpness. Then everybody wins. It is very nice to be able to force it in the driver, and hopefully dx11 support will come. Will be very nice for the next gen consoles.