Okay okay, I confess:
...I use a book on my kobudo journey...
But hey, give me a break, I also make notes.
As I am studing kobudo I try to learn step by step. I found it hard to remember techniques, since I only have kobudoclass once a week. I also study at university, so sometimes I just have a hard time to concentrate on all those those differrent things.
So I started to take notes after class. What did we do and to what should I pay more attention to.
Recently I found a book on the kobudo system I study. It helps me on days that I don't have training. I can look up what techniques follows-up the next etc.
I find it very usefull. My sensei says I'm improving quite fast.
But it wouldn't have work without my regular kobudoclasses. So I see using a book, or article only as COMPLEMENTARY to regular training. And that's what I think everybody should do.
Not reaching for books, but only if they do, do it as a complementery learning aid.