Scalability is a huge problem. You'll eventually be subject to their usage limit approvals which is a complete crapshoot. If you try to contact them for more information, you'll be sent automated replies. Certain departments have shady practices, where they have people who aggressively deletes anything questions or complaints that have cast a negatively light or show their inefficacies, so even through online forums you can't get help. We're currently migrating as much as we can away from AWS.
