I just picked this up at Costco this week. Same (nearly) as UN55EH6000.
I'm having an issue with Auto Motion Plus. If I set it to off in the menu (which is my preference for movies), it's clear that the motion interpolation is off. Good so far.
If I then turn off the TV, and turn it back on, the motion interpolation effect is clear back. In order to turn it off again, I have to go back to the menu, toggle the feature on and back off again, and then effect is off again.
I have the latest firmware (didn't need to update the TV - it had the latest). I have confirmed this problem on all sources (Tivo, BD, Xbox360 video streaming, etc).
I troubleshooted with Samsung tech support and they have scheduled a service appt for me, but I suspect this is simply a firmware bug that will need work from their engineering department to fix.
Can anyone else confirm this issue? I'm curious if its limited to just this model or not.