Yes (though I personally have only ever used it as a notification mechanism: I just click through to the page, and don't read the content in the reader. In fact the RSS reader I built for myself doesn't support any other mode). I follow over 100 different feeds through this, mostly on different sites (it's mostly webcomics, some news, artists, and youtube channels). It would be basically impossible to do this with any other tech: at best my feeds would be fragmented across multiple services. Some would not be possible to integrate at all. Services like this allow some of the sites I want to follow to fit into the system.