We are using SonicMQ, JBossMQ and the "micro broker" of Lotus Expeditor Integrator. We are using them for different purposes:
-JBossMQ is used internally and to communicate out of all our Java EE applications which run on JBoss.
-Lotus Expeditor is used in "remote sites" where we do only have limited resources and IT staff
-SonicMQ is our Messaging backbone, we use it for connecting central systems, but also to connect remote systems in approx. 1000 sites.
We are having good experiences with all of them, but our experience is also that with a more complex environment you have to do a more active administration of the Messaging system. This became especially true with SonicMQ at our site :-) . From a performance perspective we made the best experiences with SonicMQ especially in Queue based persistent messaging.
