2.5 stars
Always hard to rate an anthology, since some stories were really good and some not so much. There weren't any really bad though, and I read through the whole thing without a problem.
This was a collection of stores, some from the author herself, and others from other authors in her universe. I appreciate the author opening up her world like that and even publishing the fan fiction - I don't get why some authors are so against it. While I haven't written any myself, I would take it as a high form of flattery if someone liked my universe so much they wanted to create stories within it.
If you're reading the whole series, I would read this as well, or at least the ones from the author at the very least. It gives some more background info and you get to be in a couple other people's head too, which is good.
Overall it was enjoyable, just didn't get into it as much as the other books. (This took me a week to read, compared to two days for The Incubus and the Angel.)
It's also divided into sections, so stories that take place after each book, so you won't get spoiled for events that happen in the other ones. However, I would probably still read it after the third book if you want a truly spoiler free experience, as there were occasional comments or mentions of characters earlier than they are important (if that makes sense).