Saw this in the local record store yesterday and, despite Mendelssohn never being on my radar, gave it a spin. Unbelievably nuanced, indeed, and I love how the dial back the sweetness on some of the lusher passages.
I'm really enjoying your posts on these three box sets. Julliard Quartet has an admirably broad repertoire, going from daring modern choices to the classics to the hardcore classics to the softer side of string quartets. If I had to pick my 10 favourite string quartets, they've recorded 9 of them (the missing 10th, Feldman's 2nd, is as much endurance sport as music). I love their Ives recording and I see I also have the original Berg and Carter's 2nd/3rd in the stacks.