I really like that this software is the only one I've found that goes well beyond simple hotspot linking and allows UI based interactions. I also like the "sitemap" feature. This is a clever innovative touch!

Ease of use, quick to get started, page linking, online sharing, custom templates, very focused solution. I love that there are not too many distracting features in the UI - it's very clean and intuitive. Another great benefit is the ability to view drafts directly on a mobile device and show them to others.