I have used 3 different Schiit DACs - original Bifrost upgraded twice with the 4490 board in it at present, the Modi 3, and the Modius. Both the Modi 3 and Modius sound better than the Bifrost to my ears. This was tested using the same music server to each DAC during several listing sessions. Better detail and imaging main differences - Modius best. I suspect this had more to due with the differences in the analog output stages than the DAC chips. Have not heard the Bifrost 2, so no listening opinions to offer.
A bit of general advice regarding changing equipment - upgrades for example. Don't sell your old gear before directly comparing it to the new - greener grass - gear. Unless the difference is large, it is very difficult to judge by memory.
You speak like these electronics are as subjective as transducers. They are not. In a double blind test with a decent amount of samples/repetition, it is pretty much assured you wouldn't hear the same differences consistently. Further, if a DAC measures worse in every way and sounds "better", it's either placebo, your ears mistaking distortion of the DAC chip for detail in the music, etc. So, really, there's just no point to leaving it up to your ears alone.
"People have a tendency to overestimate their hearing capabilities.
Use your ears to listen to music, not as an analyzer." -solderdude
I'd say Schiit multibit DACs keep their values pretty well, despite their crappyness. Chances are the legend that M. Moffat invented about their superiority will outlive him.
Sure, but further depreciation in value is inevitable, even if slow. They'll never be collector's items. So, why not get the most bang for your buck?