Very impractical
It always starts on the calender page, not on the counter page. To add a countdown you have to go in the calendar month for month, you can't just choose a year and then a month and day, so if it's something that happened ten years ago you'll have to be patient to go to the date in the calendar. The commercials are always very long videos, and they are between almost every second thing you do. A good thing is that it can count both up and down.