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Having had experience with NLP, I believe that it is neither neurological, linguistic, nor programming. The leader of my first practicum site is a fan (despite being a bright, competent woman working on her doctorate in psychology). I look to this example when reminding myself how insidious NLP is in deceiving even intelligent and trained professionals.
NLP has co-opted methods and theories from many other sources in the field of psychology and succeeded at making it a phenomena that is especially focused on business, sales, and other money goals.
Though based on other sound theories, NLP is overly manipulative. Their theory may sound good but is not substantial. Training in NLP is also suspect as it encourages an undercurrent of cult-like admiration for its teachers or, as they like to call themselves, "motivators".
Even though therapy generally employs manipulation (in the best sense) to help clients, NLP crosses the line in efforts to control outcomes. I found the practices of NLP to be deceptive and unethical. In addition, the hype and promises of NLP are based on fluff that is self-activating. (In other words: You want to believe it; you then believe it and it becomes true for you--for a while. Later, your old issues plague you once again.)
The foundation of NLP is weak, with its "use whatever works" and "reality is your perception" approach. It can be destructive, especially to clients who are unstable. This phenomena is exacerbated by clients trusting NLP counselors and motivators who are insufficiently trained, yet often pumped up by ego-boosting false positivity.
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That alone seems benign enough. Words do have power. However, too much emphasis seems to be placed on the superficial for the "quick fix" rather than on the gradual and often painstaking work of genuine therapy.
NLP falls within the area of manufacturing authority by inadvertent consent. In my opinion, NLP, taken as a whole, is generally unethical. This becomes especially evident when employing "pop" techniques to reach the unconscious.
Furthermore, I find it offensive that the NLP movement passes off their program as being new, unique, and innovative when, in essence, they have stolen theories and techniques from so many other modalities (e.g., those based on strategic, brief, gestalt, cognitive and behavioral theories) without giving them due credit. In addition, they conveniently leave out NLP's history which is based on the brainwashing techniques of EST--a method that is blamed for many harmful results with their clients. Deception is the main source of NLP's power. Could YOU trust it?
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http://www.landmarkeducation.com/
(notice the slick marketing and overblown promises of this organization)