NB, I haven't actually done CSS, but for reasons I won't go into here, I've been re-visiting the theory behind biking, and CSS (books and TV series) is part of what I've been looking at.
From all the different resources I've been using, watching the recently televised series about California Superbike School, at least one thing has sunk in properly.
Tonight, on the way home from work, I did a "fairly hot" overtake. By that, I mean when I pulled back in I had to stand on the brakes quite hard (I hasten to add that the other vehicle involved was aware of my intentions - but I won't go into details on that on a public forum...).
When I did hit the brakes, I felt a little shake from the handlebars. Half instictivley, half because of CSS' lesson on it, I released the front brake a little & re-applied smoothly.
I reckon I just saved my first (tarmac) lock-up of the front wheel. The reason the credit for this goes to CSS is because of their explanation of what happens & what you should do to correct it.
Just watching the TV series has actually prompted me to put my hand in my pocket at some time & actually do the course.
NB, Other forms of advanced/further motorcycle training are available.