Very good impressions- the ones he does well he gets dead on. Others aren’t so good. He does all three male characters on Seinfeld talking to each other! But his material runs thin, where he is relying on you still being impressed by how good the impression is and not noticing that he keeps repeating the same gag. Like Madden rambling about Brett Favre. He can riff for a good long while on Bush, though.