Apart from the sound problems (intermittent thumping) inherent in the master tape of No. 14 "Death and the Maiden", for me there is a problem with the overall approach of this distinguished quartet. Their tempi are slow, yet they use little rubato; their playing is impeccably tuned but, to quote Browning, "a common greyness silvers everything" and sent me scuttling back to performances by quartets such as the Juilliard, who really feel the music and bring it alive in a manner quite foreign to the Italians. The last thing Schubert, that most emotional and mercurial of composers, needs, is a measured approach to his glorious music; it is not meant to be played like Mozart but in a truly Romantic style: febrile, obsessive passages alternating with achingly poignant melodies.
Given that some other reviewers clearly hear only perfection in these performances and that their reviews have attracted many supportive votes, I suggest that you listen before you buy and decide how you like your Schubert, especially, as, if you look carefully, you will find that several other reviewers, like me, sound a note of caution. I don't like their measured, understated manner at all, and will always need more verve, urgency and commitment than these cool accounts provide. (Incidentally, I have exactly the same problem with their Beethoven.)