Yes, dual layer media is still too expensive but my use would also be for the occasional full quality backup of a movie (or trilogy ).
I have now spent ~$35 on six pieces of DL media. The three Riteks were a waste - all of them pixelate and skip. I have burnt one Verbatim so far and, although I haven't watched the entire move, the layer change worked fine and have not yet seen a pixelation or skip. I will keep my fingers crossed.
Heck, I almost could have bought the entire retail trilogy for the same money. But my main geeky goal was research and what's $35 in the name of research?