Pros

• Super simple setup and config
• New Relic integration
• Git version control and deploys
• Varnish in the cache layer and Nginx as load-balancer
  
• MySQL db default; Mondo hosted DB addons available

Cons

• No dev/test environment(!!)
  
• No default support for Symfony2 but manual installation is possible (http://www.developly.com/using-symfony2-on-phpfog-now-right-now)
• No remote db access or automated backup to external systems. Requires RDS configuration. (http://docs.phpfog.com/index.php/features/article/amazon_rds)
• No automatic scaling