The M-Scaler gives you more. More detail. More air. Better separation. A little smoother of sound but like ricred1 said, it is not absolutely certain this will make the sound better to your ears. Most customers have been quite happy to add an m-scaler to their Dave. I have yet to have a return.
The general rule is...the better and more refined the DAC, the more an M-scaler does to change the sound. And this goes for non-Chord DACs. It was designed for the "TableTop" series from Chord so it is naturally intended to max out sound quality from a TT2 but arguably does even more for a Dave. Most Dave customers follow up and get an M-Scaler.
We have a 30 day return policy. Your obligation is return shipping to NJ.