A few of the "gurus" say it has a problem with dynamic accuracy?
http://www.diyaudio.com/forums/digital-line-level/275444-most-accurate-r2r-nos-dac.html#post4350335
http://www.diyaudio.com/forums/digital-line-level/275444-most-accurate-r2r-nos-dac-2.html#post4369948
Cheers George