Pretty generous considering it's Lilith. I had 65,000 diamonds so I decided to spend 12,000 to get the rewards. I don't regret it. There's that new pilot hero. I won't bother using him until we have all his soul stones at the end of the month. But the good thing was summoning Alecia - I've wanted her for ages. And I also got the Firehawks Radiant Wings (about damn time).
At the end of this month we get another skin. I'm thinking Sylphi is who I'll go for - provided that it's the same set of heroes.
What did everyone else do?