Eh, at best it seems to me like one of those “movements” that kind of make it seem like they think you should join their group or community and/or go to their meetings to do what you should be doing simply as a Christian to begin with–in other words, it seems superfluous. At worst, at least from what I have seen in some sources online, they can promote a watered down version of Christ’s words “that they all be one” to be more of just a peaceful “being together” that ignores religious differences (ie they promote more of a social oneness detached from the transcendent).
They have an official juridical status in the Church as an international association of the faithful.
I am of course open to correction from those with a more intimate perspective.