I caught some conversations with developers at brainshare that
suggested that it's okay to use one centralized broker, even to sites
with slow WAN links because the NDPS manager on the remote server will
cache the drivers anyway. So it shouldn't cause any extra delays or
bandwidth problems.

Could someone verify this? and is there any documentation about this?
My research seems to come up short.

Anyone else using this method real world with great results?