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Question: Vizio SV471XVT black level - too high?

I read a review (http://reviews.washingtonpost.com/product/VIZIO/SV471XVT.htm) that said this model's has a very high black level (at 0.41 cd/m2, when other displays are at 0.1 or less), which means that blacks have a rather muddy, greyish look. Is this factual and should I be concered? Thanks!