Great recommendation David. I was able to watch all 4-seasons through Sundance Channel on-demand. I felt the acting was extraordinary. At times it can be considered a bit slow moving by some, but the drama and characters still kept me enthralled. It is up there with Breaking Bad, Better Call Saul, Walking Dead, Sopranos.
For anyone interested, there was a mention in the final episode about a song that John Lennon and Harry Nilsson recorded together. My search came up with the following. Anybody wish to submit otherwise?