I paid quite a bit more for my copy than it is being re-issued for -- and would gladly pay it again. The material is seminal to seance technique -- and how it translates at each venue size is left to the performer.
This gives inside work on seance -- and seems simplistic -- but mechanically seance is simplistic. It is proper performace and construction of atmosphere and drama that will deytermine how well the material will work for you.
If you are putting together a regular venue seance (seating 10-20 say) do not miss this book.