The UI is super slick. In that regard, I would say I like it better than something like Adobe's form Designer.

I would suggest trying to add more objects, like tables and such to make it easier for people to make the form they want. Maybe something like an option to make custom objects made of other objects? Also, being able to fill the form from existing data is useful too. If someone wants a form that dynamically grow depending on how much input there is, I'm not sure how PDFAmigo handles that, if at all. For instance something like an order form, where a user would want to be able to order 1 thing or 100 different things (which could mean multiple pages, etc...)

With all that said, this is a really nice polished product, and the interface you have so far is a pleasure to use, great job!