The iPad has been penetrating the consumer market at a faster clip than the DVD player did when it first launched:
iPad sold three million units in the first 80 days after its April release and its current sales rate is about 4.5 million units per quarter, according to Bernstein Research. This sales rate is blowing past the one million units the iPhone sold in its first quarter and the 350,000 units sold in the first year by the DVD player, the most quickly adopted non-phone electronic product.
My memories are a bit foggy, but I think DVD players started out pretty expensive, whereas the low end iPad is under $500. The article touches on that fact - read the whole thing.
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