Another approach is to don't Import/"Existing Maven Projects"
but instead do the following:
cd JBOSS_GIT_ROOT
mvn eclipse:eclipse -DdownloadSources=true
Eclipse IDE -> Import/"Existing Projects into Workspace" --> "Select root directory" JBOSS_GIT_ROOT
From my experience M2Eclipse was terribly slow (at the time I used to use it) - not sure about its performance ATM
Rio