The difference between them is mainly the Vibration control on the $899 version, which if you can afford it is worth every penny. A digital is half the price of a pair. Got a week+ on mine now and I am getting more and more, I am still hearing huge improvements especially in tight bass, more fullness, more 3D stage and silkier vocals. I have the $599 version with smaller silver adapters and don't feel the urge to upgrade tothe $899 pair, as things have never ever been better. I believe there should be a thread titled Audio Breakthroughs which these cables should headline!!!!