Summary
The Unlimited Plan gives you that ability to publish as many eBooks per month as you require. The eBooks can be published in both Smart and Traditional PDF formats and will not include the Beacon logo.
Limitations
With the Professional Plan you can only use one custom domain with your Beacon account.
You will not be able to share your Beacon account with other people.
You will only be able to add 1 Sender Signature to your account.