It's too expensive and has dangerous vendor lockin. I myself was burnt 2 years ago and vowed never to return to that platform. Now we use combined Heroku and AWS services. However I do miss GAE though, its deployment is smooth, their auto scaling up is great. It's just that I don't want to be locked in any more.
That being said, we still use GAE as a platform for fast prototypes, as a cron service to keep our Heroku instances up + firing up an EC2 instance every night to run a script for 5 minutes. So we only use GAE when there's minimal risk of being locked in.
That being said, we still use GAE as a platform for fast prototypes, as a cron service to keep our Heroku instances up + firing up an EC2 instance every night to run a script for 5 minutes. So we only use GAE when there's minimal risk of being locked in.