Im testing it and looks very promising to use in new project of open world with day/night cycles that I have in mind.
But should I trust that this feature will be ready for production nearly?
or suddenly Epic could remove it from the engine even as a experimental feature?
or should I trust that if that happen for sure will (would) be be a better replacement for that?
can anybody throw any light 
about this topic ?
(BTW I know there is some custom code GI but I would focus in the Epic version of it)
(BTW2 Im testing out CryEngine too, it looks impressive, it has out of the box water and volumetric clouds that work well with its GI solution, it’s getting hard to stick with UE4 tbh regarding this kind of matters I mean)