Based on the Steam Top Sellers list in recent weeks, it seems like the DLC for Cult of the Lamb has sold pretty well. However, if I were to give my two cents, I would say that it isn't worth getting. It offers some new skins and some new decorations to play around with. However, I found that this game really struggles to retain players after the main story is complete, so unless you were hooked on the decorative and cult-management side of this game long after the credits rolled, this probably isn't a worthwhile investment.