They are a superb quartet. I had the pleasure of hearing them play several times during my time as a student in Buffalo, including a concert that closed w/ Fragmente-Stille, which remains one of the concert highlights of my life. I've never been in a room w/ an audience so completely enthralled and engaged.
Having been at that very same concert, want to second how enthralling it was (I am biased, having played with them, also played Spahlinger's big violin and piano work with Clemens, but they are still great, and I would think that without a personal connection).
There was a level of deep concentration and total committment in that performance, absolutely devoid of anything done 'for effect', so to speak, a sense of the thwarted expressiveness, with all its disjunctures, the impossibility of achieving the forms of unmediated expression that belong to an earlier era, in ways that were quite unique.
