Nice book. Fun stuff to look at......first book very dated, second is slightly better. Depending on how gritty your campaign is, be careful about what you let your characters have the ability to get their hands on, as it can swing the power dynamic in your campaign quickly. Pdf is fine, but book (as catalogue) is much prefered. As someone who owns all the books, or has the pdfs, I would say that this is not a must, but it is pretty cool.
[3 of 5 Stars!]