I tried a stereo type CES device for about a month and had mixed results with it. The CES unit was designed to work in conjunction with a Mind Machine to enhance the entrainment process; I was using it by itself. The literature said that the unit would have a relaxing effect without the Mind Machine which it did. I found my overall mind frame to kind of "even out" and was somewhat relaxed after about 10 to 15 mins. I really liked the idea of using it will I was doing some light activity around the house. Did it have a dramatic effect on my mind state? No. Would it enhance the entrainment process? It should if you didn't guzzle down a couple of Mochaccinos an hour before.