Dual layer media is difficult to work with. And it does not play in as many DVD players. I use it, but sparingly. DL media is nothing more than 8.5GB (7.95 actual space) worth of disc. It cannot hold 8 hours of video without looking crunchy. I'd only put about 6 hours of video on it at most. In other words, it's a little less than double a normal DVD-R or DVD+R.
There will not be a DVD "replacement" technology for at least 10 more years. All those new Blu-Ray and HD-DVD and several others are a middle step, sort of like Laserdisc or S-VHS was (or even Beta ED or CED discs). It provides almost no new benefits, and at more than double to triple the cost.
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