The point of octane in unity (or unreal) is to have a better renderer within an outstanding all-in-one creation software. Octane will blow unity and unreal renderers out of the water. Ue4 is a thousand time more intuitive and refined than 3ds max when it comes to viewport performance, material editor, content browser, etc.
This is not a real-time G.I solution. It's just a better renderer to bake lightmaps for games, cinematics, vr etc. but it comes with the benefits of progressive renderers, like almost instant fast previews. Right now, in ue4/unity you cannot have a decent preview of what your baked scene will look like with production settings. It will be a game changer within the real-time software world.