Well, I've been giving Brion Toss more than a glance and I'm not so impressed: 2.5 out of 5. Perhaps 5 out of 5 if you have a beard, smoke a pipe and smell of Stockholm tar.
There's nothing on furling gear and how to replace the bearings or stay. There's nothing on sta-lok type fittings. Etc. etc..
It's a book for a bygone age. Nice to have on the bookshelf but really not much use for today's rigging.