Dr Mix released a great video on Disco Strings
based on https://soundpaint.com/products/disco-studio-strings-uds
This looks like what I was looking for a long time 
at least more practicable than NI Session Strings on the first look.
Anybody with experiences in live situations?
Looks interesting.
Late to the party, but here is my experience with SoundPaint.
Libraries are beautiful. Really. I use Adastra Chamber strings - gorgeous. And really nice legato features. It’s 8Dio’s best stuff. And the updates just keep making it more useful - 8 layers per instance, keyswitching that you can program easily.
However, GP reports (and is accurate) a 300 sample latency. That’s … kind of a lot. I never use the short samples live with a group or drummer, because I always feel they fall out of time (that gooey thing). Plus, since GP doesn’t do latency compensation and processes in real-time, staccato notes don’t speak at the same time as other plugins in GP if they’re layered.
Using the Arcs, legatos, Sustains, though - great.
So… experiment with it and see if you can deal with the latency on whichever patch.
I did reach out to soundpaint and ask if that’s real or an error. They said that amount of latency standard and required do the “processing” going on. So … making less latency is not a priority.