Well. I think that ultimately, the library doesn't deliver.
It has tremendous potential. The basic sound is three-dimensional, there's a sense of space, depth and clarity to it that you don't hear in other string libraries. I like the shorts, the pizz, the soft longs - great stuff. But the glaring issues unfortunately overshadow the positives.
I'm having a real hard time with the cheap trickery used to create fake articulations. sfz and fp sound terrible and unmusical, because they're nothing more than sustained notes with some absolutely unfitting staccato glued onto them. I believe that the super shorts are just mangled and mis-edited versions of the standard shorts. Marcato is just staccato layered with longs. This strikes me as cheap, and should have no place in such an expensive library that's supposed to be perceived as absolutely high end. I'm surprised that VSL apparently thought that the users wouldn't have higher expectations and would be OK with this.
Overall it's disappointing how little content there really is. The library offers only the most basic of articulations, which stands in absurd contrast to the humonguous disk space requirements and the very high price. Spiccato, detache, portamento, col legno, harmonics... all of that should be standard in 2018, especially in a library that takes up so much space and costs that much money.
The whole legato thing has already been thematized more that sufficiently, so I won't go into that.
I'm not sold on the many dynamic layers either. It's great for shorts, but other than that, I don't even really hear much change in the timbre and it makes the patches harder and more difficult to work with.
The Synchron Player is intelligently designed, but complicated and there would have been way more intuitive ways to design certain things instead of employing all these patches and folders and dimensions etc. For example, a sustain patch could have instead simply react differently to key velocity for softer and stronger attacks, and have a normal vibrato crossfade control.
So, yeah. It could have been fantastic, but as it is now, the price/performance ratio is a letdown and it all just didn't pan out. I'm under the strong impression that something went massively wrong during production and what we are seeing/hearing here are the salvaged remains of a project that for some reason suffered one or more catastrophic setbacks.