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

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.