Long time DS user here, it's a great library. As far as Synchron, I am excited (already purchased) but not sure what to do about divisi issues. I use other libraries and have tried numerous solutions (splitting to two instances at lowered volume and spread in MIRPro, etc.) but have never had the best of success.
I use Kirk Hunter Concert Series 3 strings and they have a nice solution called DivisiLive (although not perfect) where they split any chords encountered among all players (up to 16 players with this library). The drawback is that they're not assignable like DS or adjustable, and you can't force the library to play double or triple stops if that's what you're after. The split is automatic. Still, better than nothing...