Joe is Joe (lovable once you get to know him), lots of interesting people come on, excellent starting point.
Deep insight into health and longevity from a very smart man.
Sean can be a bit whiney, but there is some amazing scientific understanding here
Aubrey can get a little bit woo-woo and mystical, but if you can stomach it he's lovely.
Tim is a human-robot in a lot of ways, which I personally empathise with and enjoy.
Shane honestly gives me too much information to handle, which I like.