I am not sure that this is the appropriate location for this post, but hey... if I am wrong, I am sure the experts will help me get on track.
We are in the process of evaluating the jump to 5.1.0 from 4.2.3 and notice many disturbing issues. Yes, it appears that 5.1.0 allows for greater flexibility and JSR268, but are the additional features really worth all the effort of completely having to launch a new application? I ask because I do not see where there is any mythology to upgrade.
