The cameras that TWiT uses are Canon Vixia camcorders, which are consumer grade HD camcorders. Like most digital camcorders though, they do best when there's lots of light. In a studio where light is controlled, they work great. Leo's not sure how well they'd work in the field though. If it's going to be used for shorter video in the field, a lot of people are using DSLRs now.
Leo has had very good results from the Canon Vixia cameras. He has 30 of them that are on 24/7, and not one has failed after a year of nonstop use.