If the subject interests you, I'd recommend it since I've personally found it difficult to find detailed information about side projects. I purchased it partly for the information, but also to hopefully motivate myself to pursue some projects I've been thinking about. I do feel like $25 is a lot for any book, let alone a relatively short PDF file, but I understand there's a limited market.

I feel the same way. I read founders at work before and I am not sure I want to spend $25 just for motivation at the moment :) Thanks for your replies.

I had a chance to look it over. It's a straight forward Q&A format and which packs a lot of responses from startup founders into a single document. If that sounds appealing to you then I'd recommend checking it out.