I bought a few dl disks just to try out the new burner (nec 3500a). It's soooo much more convenient on full copying, especially for episodal stuff. I don't mind using regulard dvd's for data and net rip stuff, but for movies and such I won't use anything but dl...I happen to like having the full movie with all special stuff with no hassle on my part to get it there.
That being said I'm not out copying like a mad fool because prices are still hovering at $5-7 each. When prices drop below $3 a piece I'm on it though, which should happen soon this year. Production ramp-ups are taking place now and the industry buzz is that by the end of summer prices will be at a decent level.