I have the GS-D3s on my daily driver for over two years now. They're excellent tires. Phenomenal grip in the wet and excellent resistance to hydroplaning (even on my wrong-wheel-drive pos), the dry grip is very good as well. Most of the tires with aggressive thread patterns tend to be loud (especially as they wear) but these have remained quiet and they're about halfway to the wear bars. I don't think they're "touring tire" quiet, but they're quiet for a high performance tire.
Don't even think about driving in snow or much less ice though. I already tried and it was the most terrifying drive home i've ever had, although i did manage to avoid hitting anything or anyone.
Lastly, i don't know if this holds true across the entire GS-D3 size range but my tires are a bit wider than the Dunlop's they replaced even though they're the same size.

btw don't buy Dunlop's, they suck! at least their performance tires do.