Which Ebook Companies Are Best for Authors?

I’m exploring different ebook companies and wondering which ones are truly reliable for authors. Do these companies provide strong distribution and fair royalty options, or do results vary widely? How important are services like formatting, marketing, and ongoing support when choosing an ebook company? For authors who have worked with ebook companies before, which ones stood out as trustworthy and effective, and which should be avoided? I’d love to hear real experiences and honest recommendations.