Excellent response. Only thing I would add is this: h) compatibility. Make sure (and test!) the compatibility of the queue with your application stack. Even th

Excellent response. Only thing I would add is this: h) compatibility. Make sure (and test!) the compatibility of the queue with your application stack. Even though a queue may advertise support for a certain stack, the libraries will range in quality and every queue has a "first class citizen" in terms of supported stack. If you're going to take a chance on an off-the-beaten path combination of application stack and queue, accept that you may need to extend or even fork the client library to make sure it fits your needs. Queues vary in complexity, and often a lot of complexity gets pushed to the client.