As a long time fan of Changeling: The Dreaming I have been waiting for Changeling: The Lost for some time and I am delighted with what they have done with the game.
Goblin Markets is my first download RPG source book for any White Wolf game from the new World of Darkness, so I had no expectations what to expect from such a downloaded book. I was very pleasantly surprised by the quality of this book, as well as with DriveThruRPG's seamless service.
There is a wealth of material in here for the Storyteller to use, far to much to list here, but the material presented was clear, concise, and very useful indeed. The artwork fitted in with the rest of the Changeling Books - this was not just done as a second thought, but is integral to the rest of the series of Changeling source books, and the quality of the PDF reflects this.
The review I have given of it on my web site is fuller in detail, but in short I would recommend this source book to all who play and run Changeling: The Lost.