Hi-
I used a "Bio-Tuner" for a two hour session through some person I know who owned one. ( I will be purchasing one myself very soon.) Although it is indicated that applications should be shorter (ie. 20 min) and to be done daily, apparently the 2 hours I, (and a friend too), used it was quite successful. (Also drank water, removed metal jewellery and dipped cotton sleeves in salt water). Immediately when I got home I felt relaxed, had the soundest sleep of my life, and for next few days didn't crave cigarettes. From my acquaintance who has been using it for a long time, apparently a few sessions over a one week period or so are beneficial. Also, can apparently can stop alcohol(?) and drug/heroine addiction. I will look into this in my own home town (yeah, know some druggies...). I highly recommend the Brain-Tuner/ Bio-tuner. If any one knows amy other tips on making it more effective, please email me.