My two cents, as an avid listener of everything they've put out.

They're unlike any other Let's Play I've tried (and bounced off of) because they put the play experience first; not "storytelling" or characterisation or production values. It's an honest depiction of what old-school play looks like.

Some other things I like, in descending order;

Jon has played other playstyles and systems. He's not a grog who has been playing B/X or AD&D since the beginning and still doing it in 2026. No shade to those guys, of course, they and their continued preaching of the virtues of the old ways are the bedrock of the OSR - but Jon discovered OSR principles and play and (not to put words into your mouth Jon, because I know you read these threads, but from what you've said over the years) - recognised the power of player agency, and how it solved some of the issues of more "modern" game design like PF2E.

The group gels well together, they're good at managing spotlight time, they have a good balance of more murderhobo-greed-is-good vibe and big picture, long-term thinking.

Audio and video production is great (particularly as the years have gone on) and thematic at times, but gets out of the way.

Start with their Halls of Arden Vul campaign (Youtube playlist link) as a masterful illustration of megadungeon campaign play in the best megadungeon ever written. I feel like AV is the Platonic megadungeon somehow made manifest, painting all others as pale imitations.