According to my experience it works, but it requires a lot of kowledge to use it.
I used it a lot 1-2 years ago and was able to reach really deep trances. For me the disadvantage was that I was not able to sleep deeply for a couple of months. I was a walking zombie, I was not aware of what I was doing. But luckily the worst thing that actually happened was that I left my keys in the door for the easter vacation! :-O ... nobody entered illegally and we found the keys in the lock when we came back...
I guess I might have used the BWG too much or something else, I don't know. At least I would be very careful if I started to use it again... So take care! -Purjo
