The article itself is worth a read. The only thing that bugs me is that the author, and a lot of other people covering this story, don't mention that RSSCloud doesn't support Atom at all (or more accurately it does in theory but not in practice). I think that's pretty significant.
The article mentions that the explicit unsubscription of PuSH is an advantage over the implicit approach of rssCloud. With garbage collection being a major problem of publish/subscribe in distributed systems, the author needs to mention how PuSH deals with it in order to assert superiority. Without acknowledging it, the credibility of the article is limited
