It is surprising that an instant ensemble like this group could perform in this way.
The 1st movement is expressing tragedy in adolescence. Urgence and energy is in the 2nd movement. Delicate song of love is the 3rd movement. I would emphasize the 4th movement showing how unique music of Brahms is as in the case of his Nr4 symphony. Struggle in lonesomeness and meaninglessness of life is expressed in this movement in my view. This music may express every aspect of life from young days to elderly.
I used to play the last movement in med school days. A lecture room equipped with an old upright piano. It was sometime in fall. The setting sun was shining through the window facing to the west. Quiet except for our performance. We have played the last movement, even though we have never known what it had meant in our lives yet. The friends of mine, playing this piece with me, might have lived their lives and must be standing at the almost last chapter of their lives now. For now, they might understand first or even deeper what the music has meant.