I’m using display conditions to show/hide ACF fields (with great success- thanks!) and have just started using an ACF “relationship” field. When I try to use that field as a display condition it doesn’t seem to work - whether I use “is” or “is not” it doesn’t display. Seems like it’s not recognising that field name as valid.
Not a big deal, but just something to look at in Alexander’s never ending to do list 
SORRY Obviously this is an array type field, probably like a repeater, so I’ll try setting it up with a provider set to “custom”. Obviously didn’t get enough coffee yet today.