Absolutely.

At the risk of sounding like an acolyte, I've been reading Nathan's stuff for a while and once I decided I had something valuable to teach, I happily shelled out for Authority to get some guidance and focus on how to go about packaging and launching a course book.

I'm mid-way through the writing process and I don't regret the purchase at all.

I snagged Pete's book when it was $29. The recent upgrade and new version pushes are great. The book is essential if you want a good overview of how to get setup with Stripe payments fast, without having to read too far into Stripe's API documentation. He also includes other good ideas to improve the payment portion of your application.

Pete is legit. His book is fantastic and helped me build a subscription service (egghead.io).

I'm a big fan of Nathan's work too.

You can buy it in print for $23: http://www.amazon.com/Authority-Become-Following-Financial-I...

Mixergy interview with the author:

http://mixergy.com/interviews/nathan-barry-convertkit-interv...

Well, patio11 mentioned him elsewhere in this thread, does that count?