On the fence here (probably till the very last seconds, like last year, when I removed Tundra from my cart just before the sale ended). My first inclination was to compulsively buy SCS, but I got cold feet at the very last step (finalising in PayPal).
How much value would you all say SCS adds if you've already got SSS? I'm but a rank amateur no matter how you look at it, and I don't have any particular predilection for chamber music as such, but I like what I hear, and the idea of layering with SSS is intriguing.