OK, here you go: http://jboss.org/jbossws/downloads (JBossWS 3.4.1 binary downloads, check the Install.txt as usual for installation information)
Regarding why using the CXF based stack instead of the Native one, right compliance with standards is a reason, for instance Apache CXF is JAXWS 2.2 compliant (we contributed to that) and JBossWS-CXF included in JBoss AS 6 is passing the webservice related part of JavaEE 6 certification testsuite (btw the ws stuff goes beyond the EE6 web profile). Better support for WS-* is another reason. Performance is also better right now with JBossWS-CXF.
Well try to repdoruce your @HandlerChain issue soon.