So, I finally have all three, the IDAC2, the Behringer, and the ODAC rev B as of last night. I only had a couple hours, but I installed all the drivers, and did A/B listening tests with the output levels matched. The conclusion I came to was that the IDAC2 and Behringer sound nearly the same though there were some very subtle nuances I cant quite describe yet, but not enough to justify the added cost, so I am going to send the IDAC2 back. However, the biggest difference was between the ODAC and the Behringer. The first word that came to mind when switching back and forth between the two DAC's is that the Behringer is "brighter" and the ODAC is "Warmer". Funny thing is that when I did an A/B test between the onboard sound of my PC and the ODAC, I thought the onboard sound was warmer. My thought process on this was that the brighter sound exists perhaps because of less noise and that the noise adds in some so called "warmth" and also that the brightness may come from better dynamic range or something. Whatever it is, I can hear more detail in the background of songs and better vocal clarity. Furthermore, it is not just the "bright/warm" thing that I noticed different between the Behringer and the ODAC. I noticed that on extremely bass heavy tracks, with my SZ2000 headphones using the EQ curve I created with a 7db boost in the 15-40hz region, the bass fell apart much earlier on the ODAC than on the Behringer. I ended up with distortion with the ODAC where I could continue a little further on the Behringer before distortion in the sub bass ensued.