I have written and published a number of books and had them published by full service an co-publishing enterprises. I decided to choose Amazon Hub this time rather than the publisher that did my previous three books after exploring their track record. They did a marvelous job and the project manager was terrific. She accommodated all my recommendations and changes even those at the last minute. I liked Amazon Hub so much that I chose to use them for a revised version of a previous book I did with the three editions. I can recommend Amazon Hub for novice authors and those who are more experienced
Answer: There are many companies. I have used another which was quite good. Costs were in the same ballpark. I found Amazon to be at least as good and for this particular project less expensive than the other but not by much. I just wanted to try another publishing experience.