Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Flaky

In this his third and "Extensively Revised" version the author promises to reveal "secrets" such as getting energy for free. Yes, he says, "it is a real gain in power". Actually he leaves how to do that the reader, while describing "his" Tesla Coil design which is so primitive by modern standards as to undoubtedly perform poorly, as further evidenced by no streamer images from it appearing anywhere in his book. A reader new to coiling would be terribly lead astray by this April Fools book.Unfortunately I know of no useful Tesla Coil book in print. Fortnately modern coilers have converged on remarkably successful designs and have generously reported their works on the web. Check out the 450 watt design by "TeslaStuff" that can produce 24" streamers.