On the pricing page, the default time your app will be online per month is only 20 hours, out of the total 730 in a month. This leads to quite misleading pricing figures being presented, as it is very easy to miss that box while focusing on the sliders (as I did).
It is extremely unlikely that an app will only be running for 20 hours. The whole point of deploying is to have reliable uptime, and 20 hours a month is far from that expected use case of the product.
The default should be much more realistic, such as 710 - 720 hours.