Vista Media Center Extenders: Can they save you money?

Extenders make sense if you have a media center with four Digital Cable Tuners, which have also been recently announced but are only available through the custom install market. Currently, I pay $12.99 a month for my DVR receiver and DVR service through Cox cable. If I had two TVs with DVR receivers, I would pay almost $26 a month. Two Extenders would offer me the same functionality for only the rental price of 4 CableCards, which would cost just under $13 a month.