There is a lot of great content on Vassals of Kingsgrave, ASOIaF related and otherwise, and there a lot of great personalities on the podcasts. My one knock on the quality of the podcast is that there are certain hosts, that if they are on an episode, I am tempted to turn it off immediatly. Varley is just kind of a beligerent jerk, Nadia constantly talks over people and has very little respect for others' opinions, and Silence brings nothing to the table, but an obsessive hatred for Jon (seriously, just let it go).
Nit picks aside, this is a great podcast, especially for book readers. They put out a steady stream of content which is more than I can say for the parent podcast.