I only very seldom watch Discovery Health and don't even bother to check any of the other stations. However, this is a pretty broad range of stations -- some that I believe (please correct me if I'm wrong) get moderately good ratings -- that should reach a lot of people.
I noticed that we are airing on "Planet Green", which is probably a smart audience to target for WC, given that it's a "green" product (you could probably throw "Fine Living" and the two "Discovery" channels into that category of audience as well).