I've read several books on NDEs. With the ambitious title Proof of Heaven: A Neurosurgeon's Journey into the Afterlife and the quotes on Amazon from Ray Moody and Pim Van Lommel and the fact that it was written by a neurosurgeon, this book set very high expectations. I've been around the block enough times to suspect that the use of the word "Proof" in the title was hyperbole, just like when I read Karen Armstrong's "Proof" of God. Again, I was right. There's no proof of anything in this book. It it well written although short. It's a very quick read and it drew me in right away. There is quite a bit about Eben Alexander's life before the NDE and that is quite interesting. Almost as fascinating as the NDE itself is the fact that he contracted the type of meningitis he did (a 1 in 10 million chance) and that he survived the type of brain trauma he experienced as a result. The fact that the guy is upright walking around and talking is a miracle. So, you could say there are three miracles that happened to him that week.
As another reviewer noted, I was left wanting more of the NDE itself. Dr. Alexander talks of great insights he received while unconscious in our world. But, what he gives us in the book are generalities that most NDE experiencers seem to bring back. Those being that we are all greatly and unconditionally loved and there is a purpose to all of this madness. One of the unusual things about his NDE is, while in that state, he has no recollection of Earth. I had a friend a few years ago who had two Out of Body Experiences that sound very similar to Dr. Alexander's. He talked of places like the Core and the Gateway (mentioned in the book) and of being in a state where he had no language, no real thoughts and was just experiencing things. I haven't heard any other NDErs describe things that way.
Overall, the book is good. But, if you're looking for "proof" of heaven, I'm afraid you'll have to keep looking. I've read of other NDEs where the person experiencing them, who should have no knowledge of what is going on on Earth, has been able to describe things he could not possibly know. There's no such proof in Dr. Alexander's experience. Dr. Alexander tries to explain why his experience couldn't have been produced by his brain. I wanted to believe and I do. But, while I believe him, I don't think he proves beyond any doubt that it could not have been created as he was coming out of the coma. We've all had dreams where seconds in that dream state seem like minutes or even days.