Since my last post I've started to use GTU quite a lot on games that rely on blurred dithering for various effects. For example, the dithering in some Mega Drive/Genesis such as Eternal Champions blends very well together to provide the appearance of more colours and transparency. Similarly, I use it on Saturn games that heavily use mesh transparencies; Ellis's transparent outfit in Toshinden Remix/S looks terrible through RGB or sharp emulation. GTU can do something that the Framemeister can which a lot of shaders miss: simulate blurring that a composite connection would have (i.e. lower signal resolution) but without the awful looking colour artifacts.
Another bonus feature of that shader is that it can simulate a display with a low vertical resolution, and this enables it to be used as a very effective deinterlacer for 480i games.
I still don't use scanlines most of the time. I don't like how they look and how they darken the image. Similarly, I'd never use shaders to simulate things like curvature.
