If I recall correctly, Chord was one of the first companies to develop their own proprietary conversion circuit and it has been very successful for them. So they are somewhat unique in not using DAC chips (R2R converters aside). I don't think you can go wrong with Chord. But they have always been a little on the expensive side. I have never owned one, so I cannot speak to value. For a long time, the Chord Dave topped most of the reviews and was a benchmark of comparison for many high end products. They are a very successful product, so there are a lot of used ones out there.