I just started experimenting with this mode on my new 7.1 set-up (Denon 3803). I like the way it takes content from the side surrounds and puts it in the back surrounds. It seems to really smooth out the surround field, although it makes the surrounds so loud that some tweaking of the effect level and/or surround channel levels looks necessary. Does anyone use this mode for 5.1 or 6.1 movie soundtracks and has anyone compared it to Dolby Prologic IIx (perhaps a 3805 owner who has both)? Thanks for your input.