I have used the binaural beats for quite some time. They seemed effective in short term, but later l learned that one should use them occasionally and only if one knows how to be meditative. Otherwise, in long run, they can create a kind of conflict inside the listener who is otherwise not yet ready to accommodate the sudden neurological changes in his brain. And, perhaps, that's why they are also considered hazardous for people with heart diseases, seizures, pregnancy etc..