AFAIK the multidirectional sound makes a difference in two major ways :

First, it somehow makes the room seem much larger... switching between QS8 surrounds and M2 surrounds in my 13x23 room gave you a slightly creepy feeling that the walls and ceiling were closing in.

Second, in a well set up room (I don't have one yet, so I'm going on others comments) you have far fewer "gaps between the speakers", ie the sound from moving objects seems to move fluidly around without being so tied to the location of actual speakers.


M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8