I find Stylus severely limited in:
1) Its raw sound - it's over-processed, much of this processing is eq/distortion, which could easily be added after the fact, but here it's burnt into the wavefiles, so you can't touch it - very limiting.
2) Its editing. You can't really set up a drum kit in there. It's more or less just a rompler - so 90's

3)Choice of sounds. I don't know, I just don't like the sounds all that much to begin with. Now, if I could get in there and tweak it up (like you can with our SoundWrecks product, btw

) it would be different scenario... but you can't.
You can import ready-made kits in kontakt, but you can also tweak it up, if you want. I like that.
mbp 2.66, osx 10.6.8, 8GB ram.