A draft of Srednicki's Quantum Field Theory (QFT) book is available for free online, prompting discussions about the differences between this draft and the published version. Users express concerns about whether the printed copy offers significant improvements, such as fewer errors or additional content, given the cost of the book. Some participants note that Srednicki has acknowledged corrections made between the draft and the first printing, indicating that the published version may be more reliable. However, others suggest that the draft and the published book are quite similar, with the draft being sufficient for learning, though caution is advised when using it for class assignments. There are also mentions of alternative purchasing options, with some preferring local bookstores over Amazon. Overall, the consensus leans toward the draft being a good resource, but potential buyers should consider the value of the printed version based on their specific needs.