What setting did you have AMP on with the 71 series? Did you have it on High? Our TVs have the ability to adjust the AMP (Auto Motino Plus for people reading this that don't know what AMP stands for).
On all the new models, we have adjusted all AMP settings so maybe that's what you are talking about but I wanted to make sure you knew that the AMP settings are not fixed so you can adjust them to reach your desired effect it has on the picture.
I purchased the samsung lnt4671 only to take it back due to the amp artifacts. It was by far the most amazing lcd I had ever seen. The live feed 3-d effect was spell binding. The latest offers -the 550,650,750, seem to have eliminated these problems (85% of the time),but the 3-d effect has definetly been toned down. I want the live feed look of the 71 with out the judder, studder, and triple ball effect.Will the 8 and 9 series completly eleminate these artifacts? If so, samsung will have truly become the "holy grail" of lcd hdtv.