My take on the self-help genre is that if you can glean any particular insight that is useful for your life, then it was worth your time. "Resilience" is similar to most books in that it is wedged between being useful and being repetitive. The research here is strong (mostly peer-reviewed journals) and the wider paintbrush that is employed to define resilience as ten key factors I found intriguing. To be clear, this book is likely best for someone that has experienced a truly traumatic event (e.g. PTSD) in their life. But I also think you could discover something functional by only reading a specific chapter or two on the resilience factor that seems compelling: optimism, facing fear, moral compass, role models, religion, physical training, social support, brain fitness, cognitive/emotional flexibility, and meaning, purpose, and growth.
Happy Reading!