The M-disc team has done digital civilization a real service by building a reliable digital archive medium that is cheap - M-discs are available online for just over $2 each in bulk - tough, and widely usable with current technology.
I've been scanning hundreds of family photos and am putting together archive discs of those and other documents for my family. Until the M-disc I wouldn't have bothered because there was no trustworthy media to put them on. Now I believe there is.
Is the M-disc technology perfect? No. Only about a dozen LG burners are certified to write M-discs, although other burners may be able to. Another catch: M-discs may not be readable by every DVD player. I didn't find it to be a problem with my Apple Superdrive or LG Blu-ray player, but Millenniata engineers noted that it could happen. But given the ubiquity of DVD and Blu-ray readers I don't think that is much of a problem: if one doesn't work, try another.