It works great and doesn't take much time.
I've done it for creative writing and for dieting so far. All I do is what's in the PR book.
Next I'm going to do it for memory and then for increasing dream recall and then for management decision making. But that will take a while because I have to go to Barns and Noble and that's out of town. The Library where I am is pathetic. I'll probably do one round of DL every time I go there in the future.