I know of Blavatsky but not the others. I read a book by her together with a friend at (boarding) school, when we were about 15. We were interested in the occult. It was engaging, but there is something rather unlikeable and nutty about Blavatskaja that comes through in her writing, and more importantly, some rather disturbing things happened as a result of our experimentation and we dropped spiritual things altogether. I never read such books again.