I've got these DVDs, (my wife bought them) and while the information isn't bad, it doesn't really go into much depth and the production values are very poor (think youtube home
video quality). Rothkranz is like a 50 year old, hyperactive teenager and just goes around interviewing people on different sites in the USA and Canada, usually they are repeating similar information about common wild foods. The camera work is hand held, very shaky and there is often a lot of background noise and wind on the mic. Also there is very much a raw vegan slant on things, which may or may not be your thing. I did enjoy the parts with the people at the Living Center in London Ontario, who talk about
permaculture concepts and forest
gardening but not in any real depth (London is my hometown and was surprised that this place existed as it's mostly a bleak patch of urban sprawl surrounded by industrial farms).. Overall, I'd rate these discs as well intentioned, but poorly executed, possibly a bit of a cash grab, You'd probably be better off with a few good
books on the subject for your money. Hope that's not too negative for a first post