I'm thinking that it will be quite a benefit. I have my RM40s crossed over in front of the sweet spot. If you sit in the sweet spot, it's great. The other night, I was watching the second Toy Story (the new version -- wow, what picture and sound!), and I was sitting quite a bit off center. I could localize some of the sounds a bit more. So, I'm thinking that the CDWG will really help that situation, to spread out and non-localize the sound.
Also, some time this year, I'm going to be transferring to an overhead projector. My RM30C is going to go from the top of my RPTV probably to a stand beneath a pull down screen. I think the CDWG will be a tremendous help to spread the sound from the center channel. The only detriment perhaps will be more sound bounce off the ceiling (correctable) and the floor (harder to correct).