I definitely liked this documentary. I usually think of it a little when I see a Hormel product at the grocery store. It was impressively done and it really has an authentic feel to it. For some reason I have not yet seen Harlan County USA, but will certainly do so sometime this year.
I have seen this twice and it is definitely worth more than one viewing. While the tone starts as pro-union, there seems to be at least some hints about their limitations as well later in the film. I spent my childhood in a town nearly 100 miles north of Austin and the film made me appreciative that my father had access to more opportunities when he got laid off (we were much closer to the Minneapolis region than Austin). I could feel for the families of those in Austin during this film as it was primarily a one company town at that time and for all I know it may still be the case.
Documentaries work best when there is a focus on "real" people rather than well known celebrities IMO. This is evidence of that and I recommend this film.