Lol. I'm not planning to sell it just yet...
Really, the M-DAC is very good and with the future planned upgrades (MPAX PSU) I think it can only get better.
Not to mention it's pretty much "at home" in my system. The feature set is ideal for my configuration (I actually use the digital out's - which is quite rare for a DAC to even have).
Only a true sonic upgrade would make it really worth me swapping the M-DAC out for something different (and then at what cost??).
As luck would have it the final version of WASAPI 3.0 was released for Foobar2000 this morning. Installing this along with making a few other tweaks within Foobar has yeilded some subtle but meaningful improvements to the sound coming out of my PC. A more "analog" sound would be the best way I can describe it. Certainly more pleasing on my ears and a strong indication that I'm heading in the right direction in getting the best out of the gear I already have.