I couldn't disagree more. I've done a lot of recordings in both xp (1 hour) and sp (2 hour) on my recorders and the 2 hours are always worse than the one and I've decided that, on the whole, I'd rather burn a dual layer disc than a single layer that looks worse.
I think the only reason why dual-layers aren't being used now is because the price is so high and so few people are using them. But rest assured, any of the files *I* put up here that are longer than 2 hours will be dual-layer. The hi-def age is here and I'm not going to be stuck behind the 8 ball because single layer is cheaper at the moment. I want to preserve things in as best a quality as I can.