IMHO all picture enhancements such as MOTION FLOW should be off when viewing a native 1080p/24fps disc as the motion will be very smooth allready and again IMHO any further picture processing will only hamper this.
I would recomend it for CGI films like WallE etc. But not real life films.
Though its an divided opinion. Some people prefer the smoothness of the processing, as opposed to me who i think its too computer generated like, which is a shame as I bought my plasma on this feature......
The Big Question in the current mag has a 2 page feature on this, have a read as I'm in it!!!