Wow I feel just the opposite. I really liked Tomb of Beasts but love the Demon Cults book. Just wish they would use glossy paper...
Er, what did you like about it so much? I don't mean to derail the thread but it seems like DCSS had a lot of negatives. The hierarchy of the cults was great, but the plot hooks were blase and bare-bones, the art was reused heavily from other Kobold Press products, 90% of the bad guys are various flavors of humanoids, and most damning of all is that it frequently uses spells from KP's Deep Magic series, which is a huge dealbreaker for me. The idea that I have to shell out an additional 10$ just to make full use of a product I already bought sours me considerably on their whole brand, and was a problem ToB did not have.