I have this app and I noticed in the video that you tapped the button to enter a 0.00 amount. Just wanted to let you know that you can enter the amount directly into the field above the button and the next time you enter an amount, the button will display the last entered value. Its just meant for reoccurring amounts.

Also once your categories/subcategories are set, then entry is a snap. I enjoy this app and the latest version allows you to export to Google Docs which is cool.