In our example, we are running couple of high traffic websites on AWS EC2. Monthly data transfer out is more than 30TB. Just the bandwidth charges from AWS is almost $4000.
With CloudFlare in the front and caching all our assets (Images, Css and JS), it saves us over 20TB bandwidth per month. That’s more than $2500 savings.
Not to mention that you can get tons of other great features from CloudFlare, such as Web Application Firewall.
Worth mentioning that CloudFront from AWS charges same bandwidth rate as AWS EC2, so THUMB down to CloudFront & THUMB up to CloudFlare.