I've never tried a hippie flip, but as for the candyflip (LSD+MDMA) the acid strongly overpowered the ecstasy. Can't exactly remember the doses, but it might have had something to do with the acid dose being comparatively stronger than the X. Also, I find it hard to believe that if I was peaking on enough acid, it would be an acid vice with MDMA features, not the opposite. On the other hand, I have often thought of taking the X some 4-6 hours into the acid trip, when the plateau begins; I wonder how that would work. Should test it some time.
Anyway, I doubt it will be just ecstasy with visuals. I've always found psychedelics to be more "thorough" and "all-encompassing" in their effects, whereas with MDMA I feel strangely sober in some aspects. I always had a strong acid vibe, with greatly increased euphoria, empathogenic effects, even more stimulation (great for raves), and the MDMA actually changed the nature of the visuals - instead of seeing patterns, symbols, fractals and the like most of the time (which I still saw), it was replaced by myriad different lights, beams and auras of all different colors, glowing in various places.