James' review has done a fine job of documenting the actual contents of this product, so I'll just add my own experiences using it.

I consider this a great addition to any campaign or setting heavily involving fey themes. The core material of 5e certainly touches on fey and forest themes, but lacks breadth and some of the core subclasses with fey connections are thematically shallow. These are very evocative. I especially like the Knight-Surgeon, which has a general Arthurian feel rather than fey/forest specifically, and the Black Woods patron for Warlocks is absolutely rife with plot hooks.

I do recommend picking this up. If you're just looking to expand your catalogue of player options, wait until a sale or bundle, but if you're specifically running a very fey themed game it's worth the price.

Now to hope there'll be a Roll20 compatible compilation of this and the other Fey offerings from Legendary Games!

A collection of ostensibly fairy/forest-themed options for D&D 5th Edition. Like most Legendary Games material, this appears to be converted from Pathfinder, but unlike most of their works, it's generally not noticeable. The new options include:

• College of Fey Magic: A fey-themed bard. Not too bad, but not too fancy either.
• Jester: A jester bard. A fairly solid treatment of the concept, though it could stand to be more overtly funny. Still, this is one of the better options in the book.
• Hunt: An odd cleric domain that seems like it's trying to emulate the ranger. Not sure what purpose it serves.
• Circle of the Forest Kingdom: Appears to be a sort of plant druid, but that gets buried under the three sub-subclasses it provides. Would have been much better with a tighter focus.
• Circle of Shapeless and Primal Terror: A scary druid. Not a bad concept, with some interesting abilities, though the name needs work.
• Knight-Surgeon: A healer-fighter that basically comes off as a paladin-lite. Interesting concept, but the execution could be better, and it doesn't seem to fit in with the book's theme.
• Woodlands Cavalier: An odd hybrid of Cavalier Fighter, Ancients Paladin, and Ranger. Too blurry a concept, and an odd fit for fighter besides.
• Explorer: A ranger specialized for long-range exploration. It's fine, if lacking in combat options.
• Hidden Guardian: Apparently a sort of "fight evil in secret" ranger, but the mix of features is almost random. Doesn't really work.
• Unicorn Charger: A ranger with a bond to unicorns. One of the better options in the book, though it might have been even better as a paladin.
• The Black Woods: A warlock patron which is basically "nature red in tooth and claw". The features don't quite live up to the concept, unfortunately, as they're too similar to those from other subclasses in the book.
• Other new warlock options: There's a Pact of Thorns pact boon (which lets you cover yourself in thorns) and several new invocations. Three are trying a little too hard with the flavor text (and their changes to other invocations are odd), but Cloak of Coiling Thorns is neat (retreat and leave thorns behind you).
• New feats: Fairy Blessing gives you an in with fey, which isn't bad. True Love's Kiss lets you remove curses and other debuffs on a designated "true love" - decent flavor, but probably too specialized to see much use.
• New spells: There are a number of thematically interesting new spells in here, though a few might be over-leveled, and there's also some redundancy. Still, this is probably the most useful section in the product. Highlights include Dirge of the Victorious Knights (send a wave of ghost knights charging at at enemy), Light Prison, Out of Sight (target forgets about you when you leave their sight), Shield of Dawn (can deflect either radiant or necrotic damage), and the bizarro Subjective Reality (you turn someone else into an illusion, but only for you).

Overall this product has some decent ideas, though many seem to be lacking a certain spark. The $4.99 price tag (for the PDF version) may be a little high, too. However, if you can pick this up in a sale or bundle, there's material here that may be worth extracting (especially from the spells).

(One minor curiosity: everything but the cover of the book describes the title as "Forest Kingdom Options". Guess there was a last-minute change?) (Originally posted on Goodreads)