Pro Book Writers for Biography Writing – Reliable?

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I’m looking to write a detailed biography of my grandfather, who lived through remarkable historical events. Considering Pro Book Writers for this, has anyone used their book writing services for biographies? How meticulous were they with research and personal interviews? Also, I’m thinking about their eBook writing service for a broader audience. Did they manage to capture the essence of your subject authentically? Please share your experiences and tips on how to get the most out of their services. How did they handle sensitive topics and ensure accuracy?