I used the montage that is supposed to be beneficial for anxiety/depression for about 20 minutes a day 4 to 7 times a week for about 6 months. It seemed to blunt anxiety on an ongoing basis and turn down the negative internal voice. It was beneficial.
There is a great deal of information on various montages and their benefits (accelerated learning, quicker development of physical skills, etc etc.) Including scientific studies and a variety of devices. Applications of TDCS have been used to help accelerate the training of military snipers and other applications have been used by professional and Olympic athletes.
I figured this was something that people who are interested in self development might be interested in, that some here might already be doing, and there is plenty of information around the internet if someone wants to get into it. Entry level is pretty cheap for this. You can find basic units on ebay for under $30.