Thank God for developers like this
This is what iBooks Author should have been. Its 2015, and creating and publishing a book shouldnt be like breaking into Fort Knox. These guys made it easy, and they made it affordable. Give them your money. Support them. I bought the Unlimited Package and have no regrets. I hope they keep up the great work and continue refining the experience, even if this doesnt catch on right away. Id like to see a companion iOS app that I could use to read my drafts, and Id like to be able to make changes in the iOS app and see those changes reflected on OS X (synced in the cloud, I suppose).
squintr about Vellum