Assuming you somewhat budget your blu-ray purchases then i think it simply comes down to how much you like the movie.
I'd say that probably 99% of blu-rays are superior to their DVD counterpart, but i'm not exactly rushing out to replace all of my old DVD's.
In this particular case it was a no brainer, since Dazed and Confused is one of my all time favorites and a film i'll revisit on a yearly basis.
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