This show is excellent. I watch it frequently and it always has something new and informative. Also, it doesn't focus on one specific area or time period. They have all sorts of information presented and arranged in one-hour segments. The info is enoguh that you know what you're talking about but not so much that you feel like you should be taking notes on the subject. The show flows along flawlessly and even provides interesting tidbits of information before going to commercial. The show is upbeat and fast paced but not so much so that you have to constantly use the DVR rewind feature to go back and get the info again. The show is also written so that the information is easy to understand but it's not so dumbed-down that it feels like they think you are stupid.
IMHO, it's one of the best shows on television.