I've experience that it can be tricky setting up content provider. Content Providers in EPiServer is a way of publishing external data as pages/blocks etc. Here is an example of an RSS Content Provider.
Sometimes you want to customize your mirrored content, in this example I can customize the url segment, setting the ACLs, and localization. And we do use Fetchdata.
Content Providers in EPiServer is a way of publishing external data as pages/blocks etc... but also a way of publishing content in several places on your web.
