Bit -
I don't use SSD too often, and then mostly just to fatten other tracks.
One thing I've noticed is that SSD didn't seem to play well w/ Toontracks loops - the hats and snare often seem to lose diversity in terms of velocity, so when you have lots of soft hits on the snare for example, SSD can sound machine-gunish because it doesn't seem to have the same velocity range as EZ/SD or BFD.
That's my experience w/ it. I tried to use it on 2 drums tracks I had put together w/ EZ and it just didn't work the way I wanted, so I didn't insist or investigate any further.
EDIT - IIRC, I did my tests using SSD EX. I don't know if things are different w/ the full version, which I have but just didn't find the energy to test. And the uselessly big clunky GUI puts me off big time. It's like the opposite of SampleTank. :P