The content of Night Horrors is fantastic; I especially love the extra insight into the Idigam.
However, the PDF of this book is horribly blurry -- not unreadable, but bad enough that it gets painful to read from for any significant length of time. I haven't had this problem with any of OPP's other published PDFs, it's absolutely a problem with this scan in particular.
As such, I strongly recommend avoiding the digital copy.
[2 of 5 Stars!]