The option has an OFF feature because sometimes OFF is the best setting for particular devices.
You're not losing the 120Hz upconverting processing by turning it off, you're just losing additional picture processing AFTER the picture is upconverted to 120Hz.
Does that help explain?
I recently purchased a Samsung LN46C670 LCD HDTV from BestBuy and have been having an issue involving Automotion Plus. The issue is present when Automotion Plus is set to "Smooth" or "Standard" while viewing a blu-ray movie or high definition content from my digital cable service. When running these settings the image is very smooth but it seems like I receive a hitch or slight slow down intermittently. I may be a bit anal, but it is quite distracting.
It does not re-occur in the same spot on blu-ray's or when watching the same HDTV channel. To ensure it was not my input device, I have tested my Playstation 3(blu-ray) at a friends house on his LN52B610 with Automotion set to "Smooth" and duplicating my picture settings. On his Television we experienced no such slow down/hitching.
The problem does not seem to persist when Automotion Plus is turned off, but this is not a fix for me. I enjoy the effect of Automotion Plus and am curious if there is a reason this post-processing is causing an issue. Is my unit faulty or is this the nature of Automotion Plus? If it is it's nature, then why would other televisions I have tested not experience the same issue?
I have been on multiple support calls with Samsung representatives and to be honest, none of them were helpful in the least bit. Does anyone have any experience in this matter?