My company hosts our app on GAE and I could not agree more with this. GAE is horrible. We are paying close to $1000/month and we could get better performance on a $5 Digital Ocean instance. $700 of that is "premier" support which is a joke. We're lucky just to get a response back. Not to mention they broke Python's debugger(PDB) a while back and it took them three month's to fix it.
