I have owned one for the last year. It is an AWESOME preamp. I have used it with dsd and it sounded amazing. I use the pre/ad with my microtracker and love the sound. I haven't used it with my 680 digi in, however have used it as a preamp with wonderful results. I sold my V3 for this preamp and won't look back. The audient preamps are some of the best preamps going these days. Caveat, it runs on 12volt, I use a laptop battery that is the same footprint that will run it forever. It won't be the lightest piece of gear in the bag, but those running the other high end gear should check it out. I don't know how to post files, however I have given Dirk several recordings so he could check out the sound, perhaps I could talk him into posting a few clips.