All of the Open Design products IMHO are worth the money, I've not read all the way through Courts of the Shadow Fey but from what I've seen so far... lots of fun.
I've DM'ed Wrath of the River King and the Dwarf one, name escapes me, both took a little tweaking here and there but... magnificent, and RP-tastic. Open Design seem to provide plenty of places, people and stories in which the players can get immersed/involved.
Cheers Goonalan