Really pleased you enjoyed it Prob. The whole album is full of great melodies and tracks with the kitchen sink thrown at them - while remaining a very cohesive listen. Well worth a listen, in fact I'm playing it now while cooking tea. It also seems they wanted to get in on the winter themed mixtape exchange as I got this free when I bought the album:
Re. Kronos Quartet, they are really easy to overlook because their recorded work is so often a collaboration with someone else, a performance of another composer's composition or a score to a soundtrack that there isn't often that sense of "oh look kronos quartet have a new album out." I first came across them when they played the soundtrack to another Aronofsky film - Requiem For A Dream. The Fountain is a personal favourite, but most work with their name attached is worthy of a listen.
I really like that Leisure Society track, but I know exactly what you mean - as I said to DN above, I've been afraid of investigating them any further - probably for the reasons you mention. Glad it was otherwise a good mix for you!