I was a big user of appengine in the last couple of years but have slowly moved off for cost reasons. It is a great service getting started, and scaled amazing

I was a big user of appengine in the last couple of years but have slowly moved off for cost reasons. It is a great service getting started, and scaled amazingly, but as the userbase grew, the cost became too much. There are certainly ways to mitigate it but for me it was not worth the extra time investment when it was mostly my side projects causing the problems.