Good to know. I've noticed that NixOS hosts their binary package caches on CloudFront, which I assumed was because it's cost effective. Those URLs are completely content addressed so they're optimal for CDN caching. Is there a significantly better alternative to S3+CloudFront? I'm pretty influenced by brand names in this situation because there are so many random hosting companies out there.
You can keep S3 if your cache hit rates are good enough and still save a lot. S3 is great for the storage for e.g. durability, as long as you can avoid serving up too much of your content front it.
To be honest I rarely use external CDNs and instead "roll my own" with a variety of providers as with cloud providers + geoip enabled DNS you can get 90% of the benefit at very low rates, but in terms of "brand name recognition" MaxCDN is worth checking. It's not nearly the maximum saving you can get, but it can be substantially cheaper than CloudFront.
