I wrote a review on the Amazon link here now that I have read both books:

"I have been following Ernst's experimental and historical investigations for some time now, and I have to say, this is a fantastic quick read introduction on the finer elements of what is left out of the common gossip circle of Mr. Tesla. Ernst brings our attention to his communication style and critical details that repeat throughout Tesla's engineering explorations. Without the guidance of Ernst, the casual reader may never grasp the true tangibility of what is today considered as a "dark art". Ernst's work has continuously brought me inspiration and a renewed sense for purpose in life. I strongly recommend this book especially to those who yearn for the positivity of future days."