Cymbals, for instance, sound more "brassy" and less "splashy". To me it sounds more natural, but it might create false impression of limited extension.If the switching noise output filter is set at a higher cutoff so to make the amp look to be flat to 20khz on test this will sound hard.
If it's set lower to try to rid most of the switching noise, this will already be rolling of at 10hkz and therefore rid any cymbal harmonics, this will sound more natural but not very extended.
So your compromised either way, the only solution is a much higher switching noise so it can be cut out totally with the output filter without effecting the audio band at all.
Cheers George