I also have the experience that it is hard to implement and to change / unlearn / learn new behavior, but also very rewarding. It took my 15-30 people company a year to get good at it, and after 3,5 years we're still learning every day.
I expect it to remain a constant learning journey. I expect society to take 50+ years to make a real change in the way we organize. Just like we've had 100+ years of optimizing top down management in all it's nuances. And I think it's super hard to change an existing org so dramatically, as Zappos is trying.
Try to find the articles that are not written from the outside, if you're looking for some confirmation or demystification. But to me it's not really clear what you're looking for, actually