Podquiz hits the sweet spot for my wife and me: it's just the right length (around 20 minutes), and just the right difficulty (we usually score 12-17, and in 250 episodes we've never gotten a perfect score, meaning it's never too easy or too hard and we always learn something). The podcast is superbly produced (e.g. smooth transitions, great sound), and the Quizmaster is very creative in coming up with new ideas for question types. He's also really open to feedback and ideas from listeners. Overall, GREAT podcast!