No issues. Orion 2.0 works quite well. In fact, it works better than Oracle because it understands how to deploy an exploded EAR directory where Oracle and Orion 1.5.x do not.
In the next release (GA) we’ll be breaking apart the Oracle/Orion connectors (as well as those for the other servers) so there will be independent configurations for all the supported versions of each application server. In the GA release there will be explicit connectors for Oracle 9i/As, Orion 1.x, and Orion 2.x.