I haven't read all of it yet but I read a good chunk and it's pretty excellent.
The issue that Amazon was cracking down on was folks who went to Google Books, found some work like *"The Inventions, Researches and Writings of Nikola Tesla, With Special Reference to his work in Polyphase Currents and High Potential Lighting" and then downloaded it from Google and uploaded it to the Kindle store , 
 http://books.google.com/books?id=bhrreukJiLgC&printsec=f... is the Google Books version
 http://www.amazon.com/Inventions-Researches-Reference-ILLUST... is the Amazon Kindle rip-off version.
Fresh book recommendations delivered straight to your inbox every Thursday.