Are Children's Book Publishing Services Worth It?

Has anyone used children's book publishing services before? I’m exploring options to get my book professionally published but I’m not sure which services actually make a difference. Do these services handle editing, illustrations, and marketing effectively, or are some just overhyped? How do you evaluate reliability and quality before committing? I’d love to hear real experiences, recommendations, or warnings about working with children’s book publishing services to make sure my project reaches young readers successfully.