I haven't used them, but be careful of their offer. If you look at their pricing, the $1 is for one credit, and they charge you a certain number of credits base

I haven't used them, but be careful of their offer. If you look at their pricing, the $1 is for one credit, and they charge you a certain number of credits based on the size of your file. Here's the catch: it could get very expensive for you if you have a site that is long-tail with lots of files, but on average few views per file. If you have a few files that need to be served, or a few popular ones, it's probably a good deal depending on the quality of bandwidth you need. However, CDNs are a good example of you get what you pay for. If you need Grade A bandwidth and a CDN with a ton of POPs (e.g. for video), my bet is that they won't hold up since it looks like they are more budget and new at the game.