Thanks a lot for those pictures. They were EXTREMELY informative. I agree that if you have nothing, or mostly do gaming, having one of these Chinese boards may be better than nothing. But the banding on the solid colours is just unuseable for my purposes (DPaint painting - where solid colours would come up a lot).
If anyone wants a good flickerfixer they can always buy a used DCE Scan Magic from someone. I have one since forever and it is awesome. It displays all 16.7 million Amiga 1200 colors and it does NOT promote PAL into 60 hz so all PAL games look great! I mostly only play PAL games.
DCE ScanMagic works in 1280x512 mode, you can bet the GBS does not.
Or you can wait until the new superduper ScanJuggler XAGA comes out.
No external flickerfixer can ever be as good as an internal one. It simply is not possible. Once the signal has left the Amiga it is no longer digital. It is analog at that point. It must then be realtime digitized back into digital, fiddled with, then reoutput as analog again. Ugh. Its hopeless.