I exclusively use my kindle for Project Gutenberg books so this does not effect me, but I'm appreciative of sentiment behind the backlash.

I only wish it was stronger.

Profoundly disagree with the author on skipping 6. It helped so much with my 7.

I do agree on clubs though. They were as big of a revelation as siteswap when I learned them and I'd highly recommend trying. Most juggling clubs(accumulations of people, not object) have loaner clubs and nice people willing to share theirs as well as teach.