This would really benefit from a "how does this relate to zookeeper". I think this is an entirely new service, with different technical insides, and trying to provide a higher level solution to what people usually cobble together with ZK.
But I'd be interested in comments from someone knowledgeable.
In writing that section, we tried to provide "just the facts". If there is anything that seems wrong or misleading in any way, we'd like to know so that the page can be corrected. It is not our intention to say "Serf is good, ZooKeeper is bad". They are very different tools, and we are just trying to highlight the differences. In fact, we believe that the strongest use cases involve using those tools together.
I didn't mean to say that it sounded like a sales pitch. What I meant is that it's talking about relative strengths and weaknesses, where what I really need to understand what Serf is is more along the lines of how the API / model differs from ZKs notion of writing to or waiting on locations in the distributed space.
But I'd be interested in comments from someone knowledgeable.
Edit: I see this is addressed at http://www.serfdom.io/intro/vs-zookeeper.html but it would be nice to have something more "just the facts" rather than arguing the serf is good.