I've bought it on Mac App Store and I don't like it much.
• The date on bottom in pop-out doesn't change automatically: this is not a good feature, it should change automatically and give at the same time the possibility to the user to go back and forward through the dates
• The geen and red icon are not useful: those makes the interface not clean
• The function "move the undone task to following days" doesn't work well: if you doesn't assign a time limit to do a task in certain day and this task remain undone, then it isn't moved to the following day