How wide is your room? Unless you can move the width speakers several feet to left / right of the mains, and position them midway along the side walls, between you and the mains - don't screw with them. I tried for weeks and gave up with my narrow room (12'). There is more information, and I suspect that if you have the space for them, then the width speakers would be terrific. Height channels add some ambiance, but nothing earth shattering. I've been using PLIIZ for over a year now and most of the time, I'm not even aware that the height channels are in the mix (QS8's).
