Hi Cyril
Currently the selection of available libraries for VSL is small, and as i only have Special Edition 1 and 1Plus I cannot test the other available libraries for you. However, the developer seems to have covered every articulation for the strings in SE1 (admittedly i have only really looked at the Orchestral strings, not the Solo ones)
i think they have started with the smaller libraries, as working on Dimension Strings for example must be a much larger job!
Dont be put of by that though, as ive used this plugin before, and it updates ALOT with new features and considering that Logic Pro has only just updated to 10.4.2 (and you'll need this version installed for the plugin to work with VSL) they have included the Cube, SE1-4 and the brand new Syncron Orchestra already! i emailed there support to ask if they planned to include VSL when Logic updated to 10.4 and they said they would include all there libraries as soon as the software allowed, so its only a matter of time i think before everything is done.
I have no idea how they manage it, as it must be a huge challenge!
As far as Score mark up is concerened (and to me this was a BIG issue) its not great if im honest. Basic articulations are marked up (staccato for example) but not much else. Ive included a screen shot of the score mark up on a test piece, and you'll notice the notes in 'Green' have no articulations marked, but the software playes them as Detache.
Now (for me at least) its not such an issue as i write all my music in Sibelius anyway as the work VSL have done with the sound sets is lovely and everything just works for me as i need it to, but now if i import the midi into Logic its a breeze to select the articulations i need and to tweek the playback to my hearts content!
I think its a perfect compromise really, and one thats only going to get better with time!
Kindest Regards
Paul