It seems as if many channels offer their shows free on line and this software would download those shows and allow me to play them on my Roku with DVR functionality. It would just be in conjunction with Vue and possibly deal with my over the air/DVR conundrum. I don't think you need any service to watch shows on line, at least not the networks I would watch such as CBS, History, etc.
This is exactly what I would like to use PlayOn for -- to watch network shows that stream free online, including the CW shows, while allowing me to skip commercials. $50 for a lifetime sub to PlayOn is a lot cheaper than $400 + rooftop antenna to go the Tivo route. It's also cheaper than six months of Hulu, which won't even be carrying CW shows anymore.