Limitations to Confluence as Online Help Source?

[James Hanson]

I'm considering moving a large body of content (currently in PDF) online. I'm a big fan of Confluence and from an authoring standpoint, I don't see any drawbacks or deal breakers. I've used it elsewhere and had no problems. Who has moved a large body of content (written for print) online, especially for a traditional PDF/printed user guide audience? Anything to be aware of?

Thank you so much.