Impressive range of libraries provided and the documentation is quite good.

Seems a little strange that the benefits are touted of using the libraries over setting up a dedicated queue service when the libraries rely on in memory queues. While the loss of the tracking data, should these queues fail, may not be worth the hassle of maintaining the dedicated infrastructure, there is a critical difference between the two approaches. These libraries are much more likely to impact application (or the servers the applications are running on) performance then queuing a message on another server.