I made the switch from Rackspace Cloudfiles + CDN to Amazon S3 + Cloudfront a couple months ago. I was regularly getting emails about my app erroring when someone uploaded a file via my app to Rackspace, since Rackspace was down (or responding slowly).
Now I'm happy with Amazon S3 + Cloudfront, it's cheaper and more stable.
Now I'm happy with Amazon S3 + Cloudfront, it's cheaper and more stable.