Well unless you have unlimited HDD space you kind of need dual layers for some stuff. like PC games, movies etc, and you really need DL if you have an Xbox 360.
I have 1TB of space and I have to keep burning stuff cause I do get very low on HDD space. Also BestBuy has sales on DL DVD-Rs every few months. Like I bought 20 packs for $20-$25 each. That's not bad at all.
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