I own and make use of about a dozen different SCENAR devices, so my thoughts about Dr. Tennant's book come from the perspective of one who has a great deal of experience actually putting his concepts and information to practical use.
First, the cons:
There is really only one major con, and that's already been discussed to death. The book formatting is not well done. OK, granted, it isn't the prettiest piece of work. That being said, it is certainly not so bad as to make the information unusable by any stretch of the imagination. In fact, quite the contrary is true, which I'll touch on in a moment.
Another reviewer suggested waiting until a second edition with improved formatting gets published. You could take that route if you want to. I suppose it just depends on how badly you need the information. Is it really worth allowing your health and your health care to continue to degenerate by not having this information, just so you can wait for a prettier format to come out? You'll have to decide that for yourself, but I know which way I would vote.
Here's a little advice for those who got completely hung up on the book's formatting issues and wrote caustic reviews because of them. If you're going to rip someone a new one for using less than perfect language skills, make sure your critique isn't written so poorly that you look functionally illiterate. Criticisms about someone else's use of language carry far more credibility when they aren't themselves filled with typographical errors, words used improperly, and sentences that have poor structure, worse grammar, and incorrect or non-existent punctuation. Something about glass houses and throwing stones comes to mind here.
Now, the Pros:
Dr. Tennant's book covers information that is right at the edge of medical science. As another reviewer mentioned, there are doubtless many doctors who would call this quackery, not because it is quackery, but because it's so far out on the leading edge that most mainstream medical people have had no exposure to it yet. Given our current medical police state, it's unlikely they will get any substantial exposure to this information from mainstream sources any time soon.
Let's be honest, the idea that electrical micro-currents play a major role in the health of the body is not something any pharmaceutical company can turn into a drug and patent at $10 per pill. If it can't be turned into a patented drug, it won't make it into the curriculum of any medical college. There will be no ongoing medical education seminars that discuss it. No pharmaceutical rep. is going to take a doctor out for free lunches or on paid retreats to Rio or the Bahamas to discuss it. And if the doctors don't have any information about it, what else are they to think when suddenly confronted with the whole concept? Quackery.
To be versed in this branch of research a doctor would have to go out of his or her way to find and evaluate the information. This is difficult for many reasons, not least among them being that the lion's share of the research and experimentation on using these micro-currents for restoring and maintaining health has been done in Russia. Most of the data is still in Russian, and the quality of translations for the little that has been translated is extremely poor. In fact, if you view or read these translations, most of them border on being incomprehensible. The translations are so poor as to make them useless to the English speaking reader. Contrast this to the less than optimal formatting of this book. Is the book better or poorer than the Russian translations? Bad formatting notwithstanding, this books is a thousand times easier to make sense out of than the bad translations of the Russian materials.
Add to this the fact that any doctor (at least in the US) who attempts to incorporate these principles into professional practice will lose their medical license quick, fast, and in a hurry. Everyone who has read this book or seen Dr. Tennant's video presentations will have noted that he scrupulously mentions at the outset that the information he is about to present is coming from Jerry Tennant, the minister, and Jerry Tennant, the researcher, but not from Dr. Jerry Tennant, the medical doctor. He has to present the information in this way because if he offered it as professional medical advice, regardless of how true or how beneficial it might be, his medical license would be revoked immediately. So will the license of any other doctor who dares to offer a treatment other than drugging, cutting or irradiating.
Anyone who doubts this need only go to the FDA's own website and peruse their online list of warning letters they've issued to those making what the FDA says are false medical claims. Case in point, Dr. Andrew Weil, a famous, Harvard trained physician was sent such a letter just last year. The FDA threatened Dr. Weil with fines, seizure of property, and criminal prosecution and imprisonment because he dared suggest that some of the supplements he markets might help support the immune system, which, in turn, might help the body protect itself from colds and influenza. Wow! What a medically irresponsible concept - that we might actually be able to support our immune systems (using herbs and vitamins which have a long and clear history in peer-reviewed studies of supporting the immune system,) and that a healthy immune system might actually help prevent illness! Send that medical heretic to the gallows!
So I do not blame the rank and file doctors for not having any working knowledge of the subject matter of Dr. Tennant's book. Their medical practices are directly under the control of the pharmaceutical industry and its Gestapo-esque enforcement arms, otherwise known as the FDA and the AMA. Doctors can only deal with the information they have, and they are only allowed to have the information the Pharma-Nazis say they can have.
To Dr. Tennant's credit, he has managed to step outside this restrictive Pharma-Nazi box and provide a great deal of information in this area of research to us laymen. I don't read Russian, and I don't speak medical jargon particularly well, so Dr. Tennant's book is a treasure trove of information I might not otherwise have had access to.
There are other books that deal with electricity and health, such as The Body Electric. But most of these books are fairly old. The material in Tennant's book integrates the newest in medical knowledge with this body of research coming largely out of Russia. As I noted up front, I have and use about a dozen different SCENAR devices, all of which are produced in Russia. In learning to use these devices I have been limited in large part to using extremely poor English translations of both written and video materials from their Russian originals. I learned far more from Dr. Tennant's book than I have from all of those poorly translated sources combined. Many things about the use of SCENAR devices I learned through trial and error. I figured out what worked, but I didn't always understand why it worked. After reading Dr. Tennant's book, I now understand why things work as they do.
So, is the book formatting ugly? Sure, but it's certainly still very understandable. It's far more understandable than anything you'll find translated from Russian into whatever language you speak. And I can also say that correctly using these devices has done wonders for my health, the health of my family, and for many with whom I have shared them. I wish I'd had this book years ago as a reference. It would have saved me a great deal of time in the learning curve.
Update 3-21-2012
Dr. Tennant has released a new book specifically targeting the use of SCENAR and eye problems. I have not seen it, but based on reviews it is my understanding that it has the same poor formatting problems. While I understand that he was essentially a first time publisher when he wrote the book currently under consideration, and that he had some unexpected problems with the formatting because he was new to using the writing software, and it did not convert as cleanly as expected, etc., I am at a loss as to why a second book would come out equally poorly in terms of formatting. Dr. Tennant, once is a mistake. Twice is carelessness. You should produce a better product if you want to continue selling books to the public. Please, make the effort. Your work is too important to be shot down by carelessness.