Nice
It looks better.. but unless it's part of the SNES chip it should be part of the MESS video output, not part of the system emulation. Many Megadrive games benefit from similar, but it's definitely not part of the genesis VDP. Polluting the emulation code with hacks to make the video emulation look nicer isn't really progress. If it is part of the SNES chip, then, yes, very nice :-)