According to the PECON rules (http://rules.swcombine.com/economy/planetaryeconomy/), they increase morale and increase planet income.
I am wondering if there is a typo there because that seems to make them very, very, very good. I think they may have been omitted from the Morale Facility [W] list. Can someone check the code to see if they should be on the W list and its a rules page typo, of if they are in fact not on the W list in which case they are uber good facilities. Thank you.