I'm working through the Penguin audiobooks at the moment, and am really enjoying them.
I started with The Pit and its an excellent adaptation. It does require a keen ear to identify the many judges, though.
America is interesting. They include a lot of the Democracy stories, which are very useful in terms of context, but don't include of the Beeny follow up stories. This means that, having listened to a Wagner script throughout, it ends with Ennis' Twilights Last Gleaming. I know Ennis has in the past been critical of his own Dredd work, so I don't think I'm being controversial when I say that I think the storyline and characterisation are completely misjudged (pun intended) and undermine a lot of the previous stories in the audiobook. I wish they'd made a different decision on that.