First off, I love the sound, and the changes to the soundstage. Highs are more clearly defined, which is where I heard most of the improvement, but midrange is a bit clearer too. Massive improvement on my PC, with the USB sounding just as good as the optical. Also a huge improvement playing my Airport Express through Airplay on my receiver. I assume that it handles the jitter better than the built in DAC in my Denon unit. Other inputs (Blu-Ray player or my my Oppo transport) don't sound different. I am sorry I do not have an original Modi or the Modi 2 (non-Uber) to compare, as this was my one question I had when purchasing the unit. I am interested in hearing anyone who compares the Modi 2 to the Uber- does the upgrades to the analog side on the Uber improve the sound noticably? 

To sum it up, the Modi 2 Uber has great sound, is easy to set up with no worry about USB power management configuration, and is an awesome way to get really fantastic sound out of your pc. I would say it is a wash when compared with well executed DACs built into more expensive receivers, but this is a huge win for a $150 device compared with a $1,500 integrated amp... Well done!