I got Spitfire Chamber Strings recently and I think I have found my new favourite combo - Spitfire Chamber Strings + Berlin Strings! Here are some short test tracks that I did (all contextual) where both are layered to create an experience as a whole. The track Holiday Adventure is mostly Spitfire in the first half. Berlin Strings added for violins and couple of other layers in the second half. But the core sound is very much Spitfire. Both seem to work very well for me. Chamber Strings (Sable) is also possibly the best string library from Spitfire. Anyway, I hope you will find it enjoyable!