Listened to the LibriVox recording of Frankenstein. Quite interesting, although I'm not sure if I liked it. It was fairly dark, with a fair amount of anger. But as a cultural thing, it was interesting. No Igor, no bolts from the neck, and the monster never had a name; Frankenstein was the name of the monster's creator.
I don't suppose I would say I regret the time spent, but I would rather have listened to more Sherlock Holmes stories, though.