I can easily set up my server side caching for static content with cdnsun without having to worry about any technical details or issues related it as their support is great!! There's nothing not so good in this service if you want just use them because they give best quality results which i am sure other providers don't provide at such low price range! They do charge some amount per GB but its worth taking advantage off those offers otherwise go ahead & enjoy your benefits from these awesome guys.
Nothing much really except one thing - there should be an option where we could choose our own cache duration instead of being limited by 1 month only..