Been running / listening to one for over a week. Impressions over the STX, the 2 version has better detail, separation, extended highs and bass. Middle range is a little more recessed. I would say overall that the original STX is a warmer Hifi type sound but the new version is more analytical and studio like. (This is without experimenting with the other op amps included). Both are excellent sound cards but the rest of your sound system needs to be good to get the best out of them. I currently use a pair of Adam 7Xs and 7X sub base with software volume on full and passive overall volume control.