Without marble I never really build it. Even with marble, I'll only really build it in very specific scenarios. Maybe I'm isolated with tons of forest and only have one city with good GP generation, so I want to get another city to pop at least one scientist without having to stagnate at size 4-6 or whatever. Where I think it is really good is if you get both stone & marble, because then you at least get two rep scientists if you have mids. The problem is you have to go for literature pretty early to get it, and if you're getting early literature then the music race becomes tempting and everything else might get delayed a bit(assuming you can't just trade for math, iso or semi-iso).