I guarantee these firms will fail. Most of these firms request their contracts exist for a specific period of time ranging from one to five years or more. However, Booklocker's contract can be terminated immediately on request, which is a helpful alternative for authors who have been contacted by traditional print publishers. We removed her books from the site within hours. If you doubt my completely biased opinion, read the contracts at the links below and compare the benefits to authors.
Links below are to contract pages, where available.
Screens all manuscripts for quality. And, if you don't know how to convert documents to .exe format, I will email the PC instructions to you. Booklocker's primary competitor. This firm has generated a ton of publicity and gives authors high-exposure. Pays Quarterly Non-exclusive rights Does not screen manuscripts.