I'm in the market for the 4671F model and having been to some stores to compare, the 120hz and better contrast ratio really do make a difference, at least to me.
The 120hz processing does introduce a few artifacts, though, and in earlier units of the model have the "triple ball" effect in sports.
But it does eliminate film jutter and the picture is just extremely crisp all around. If your parents aren't the type of people, you think, that would notice these details then the lower end model is just fine.
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