Very confusing without (ironically) a good helpbook of its own. Took me a few minutes to figure out that you have to click "Add Localization" before you can do anything else. It seems to me that when you create a new helpbook, an assistant should appear where you'd enter the first localization (it should default to the current language for the system), the application name (so default pages don't all have to be changed from "MyApplication" individually), and then the other properties found in the (unnamed) drawer.

A huge issue is that the "Save" command is never active so the only way to save your work is to (unintuitively) close the document you are working on and let the app then prompt you to save your work.

I added several pages and while "Start Point" pages appear fine, where do the "Help Topic" pages get linked? How do I manually link pages to, say, the index page? There are a lot of other minor nitpicks (it doesn't encode high-ASCII entities, etc.), but it is promising (it has potential for being great) and, of course the price can't be beat.

Hopefully the author will take these comments in the spirit they were intended: as constructive criticism to help a good idea become a good product.