fackue wrote:Bottom line that I'm looking for is whether, if the SNES emulation is my main reason for purchasing a DC, it would be worth it.
I never played the SNES emulators much, though they're a bit rough if you're not used to low framerates. The currently best SNES emulator, DreamSNES, isn't perfect but it also isn't all that bad. I'd say it's about 50-75 percent of how an actual SNES would perform.
The real bottom line on SNES emulation for the DC boils down to what games you are planning on playing. Games like Donkey Kong Country and a few others actually probably run closer to 80% of full speed natively, and with the auto frameskip of DSNES, they run at about 95%, but the sound is a little buggy. The sound is even more buggy on SuperFamicast for that game (and the other two in the series), but the game seems to be more playable.
If you're playing games with transparencies, there is very little chance you'll get them to be playable (from what I've heard, they're probably lower than 50%, and that's with the transparencies turned off).
If you're playing games like Super Mario World, it's probably close to 75%, but it's definitely playable.