I should say that judging on fine-but-contrasty grain removal this filter is the best of all I tried. Its effect reminds me he effect of high-end DVNR devices I've seen at TV-stations recently.
Also I can't see any need for scene change detection: with parameters set at (7, 10) there are positively _no_ scene change artifacts.
(BTW, thank you for DeSpot filter. Too bad E-Gold still refuses my payments
)