Great value for the amount of content. The summoning rules can be used as-is or be a point of departure for creating your own bespoke summoning rules. The demon list provides a good thumb-nail description and can be used to randomly select a demon, if you find yourself in need of one.

I was surprised that there was only one demon with the rank of knight. But I suppose that the RPGPundit knows best, and of course you can change the ranks as you see fit.

72 short write ups of Demons. Appearances & what powers they can grant those strong (foolish?) enough to summon & bind them. Great for any fantasy RPG but even better with Dark Albion, Lion & Dragon RPG.
Hopefully this great supplement and some others are put together in a print bok for Lion & dragon RPG. The Lion & Dragon Companion !
Fun stuff.

In need of a demon and the kind of stuff he can do to your victim Eh pc ? Expert GM's may not need this for the summoning spell, but it does have a list of the kind of stuff demons inspired by medieval occult lore could do.