Dreller's book is very sincere and helpful, especially to non-mediums (like me). He doesn't throw caution to the wind and encourage everyone or any method; his standards are rigid, as is his integrity.
Anyone who finds this book boring needs to read more sensational stuff, the likes of which are best sellers. I think you know who I mean. If I could talk directly to any medium to glean information, I'd choose Dreller. Those who trashed his book need to READ it first!
This book has very little to do with mediumship! At best it's a general overview of all things psychic. There are no instructions or exercises. Most of the chapters are on unrelated topics, even the chapters on mediumship aren't actually about mediumship and instead focus on why you'd want to become a medium, why you'll want to work hard as a medium, and ways to dress as a medium.