I see it as the NFB-11/15 offering features that the Modi/Vali does not. The NFB has three digital inputs, the Modi only one. The NFB-11/15 comes with a separate line-output (RCA) for speakers. The NFB-11/15 can have it's firmware update, I believe the Modi can not. Better specs The NFB-11/15 amplifier offers more power then the Vali. The S/N on the NFB DACs are higher then the Modi's I've used my NFB-15.32 with lots of difference headphones (like 6 or 7, 32-Ohm to 600-Ohm) and it seem fine driving them all.