Any UE4 veterans using/purchase custom MMO dedicated server?

First, this is not another “want to build” wowpow mega MMO thread but rather to gain some insight and understanding.

Been long time since I last touched UE4, still been wondering about how one would make use of MMO server since UE4 itself does not support large multiplayer for huge tiled maps (the listen server is meh), thus Epic is suggesting us to get own custom MMO license.

So far, I know there is 3 MMO plugins around which is available for purchase. Anyone uses any of these plugins? Would love to hear some reviews and opinions on using them and what are the downsides/limitations among them.

Thanks.

If you don’t mind my asking, to what specific plugins are you referring?