Loved it. It's a good mix of funny, angsty, and serious stories which give more depth and background to the characters of both Infernal Devices and Mortal Instruments. My favourites were the Magnus/Alec stories, and seeing Will, Tessa and Jem together after (view spoiler)[Jem became a Silent Brother (hide spoiler)] 
 Looking forward to this years' stories around Simon and the Shadowhunter Academy.