This was the set that pulled me out of a 6- or 7- year dark age, so it has sentimental value to me. I think I've bought six of these, although only one was assembled. The rest were used to create skeletal cavalry (and increase my Crownie cavalry while I was at it). It has a pretty good selection of parts; I was able to build several undead creations with the pieces from the sets I didn't assemble, and the figure ratio was good (2 Crownies, 1 white skeletons, a black skeleton, a horse, and three skeletal horses). The prison part itself can be added to an undead fortress as a dungeon tower with very little modification. It has a solid playability; my stepdaughter loves it. Overall, I'd give it an 8.
"A warrior is always joyful because his love is unalterable and his beloved, the earth, embraces him and bestows upon him inconceivable gifts."
-- Don Juan, Tales of Power by Carlos Castaneda