Moderately useful, but all of the images are Victorian era lithograph in style, and have lost a lot of whatever flair they might have had. Color was not expected, but without blazon (heraldic description) or any other reference other than plate number, only the images are of any use. There is no table of contents, and although the images are grouped according to their central character (lion, tree, etc.), that is the extent of it. There is some mention of another archive, but not in a complete context. Hunting for it may be more of a chore than throwing your hands up and finding something else. I'm not even going to try. Also, since the images are in roughly the same style, an estimate of time period or place from one's own judgement of history is nearly impossible.
Still, there are a lot of images, and by themselves are inspirational to some extent.
Overall, not a complete waste, but not worth it, either.