If you're talking about Yabause-DC, I've never had any stability issues with released versions (my private WIP versions, that nobody else ever sees is a different story). Also, I think Yabause at large is one of the more accurate Saturn emulators, and it grows more so with every release (heck, I remember some Saturn emulators that didn't even bother emulating the VDP2 of the Saturn).
Also, while I doubt that in any reasonable time I'd have a working, full-speed Saturn emulator for the Dreamcast, I wouldn't say its impossible.
With enough time, and enough work, it should be possible (but EXTREMELY difficult) to get a full-speed Saturn emulator going on the Dreamcast.
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