Buggy and unstable... I find that my personal experience is largely OPPOSITE of that right at the moment- but then I'm not trying to do SVGA out and a whole host of other things that are problematic all over the place. Now, having said this, I've found AMD's offerings to be quite a bit closer to that reality than I care to use them with. Things like not being able to play video playback without doing goofy things on a regular monitor aren't exactly bug-free and are much more screwed up than SVGA out, especially in this day and age of HDTV monitors being as cheap as regular TV's and whatnot...
Now, I don't like the fact that it's proprietary- but AMD's stuff still isn't there yet for most people and actually DOES seem to be buggy, unstable, and annoying to use. Until AMD gets it's act together or Intel delivers a decently performing device, NVidia's about the only game currently in town for most situations in 3D. If you don't like that, bug the crap out of AMD to get their drivers shored up or lend a hand or get someone else to do it on the FOSS drivers for their parts.
