It's not something that suggested by members here. And ATI dropped support for it later on. Outside of the "despeckle" (aka "salt and pepper") filter, which is just in-frame NR, the filters are more likely to cause dropped frames than to achieve any degree of significant improvement. The filters also tend to blur, in addition to straight NR, hence the unpopularity.
Better NR is achieved in Avisynth and/or
VirtualDub. Even TMPGEnc Plus 2.5 was better!
These are a combination of: in-frame blurring, in-frame NR, and temporal NR. That's it.
The usefulness of the filters faded over time, as other post-processing (post-capture) NR methods improved. When VideoSoap filters came out, it was really quite amazing to have live during-capture filtering, and results were similar to then-current post-processing NR filters.
ATI MMC VideoSoap is still useful, but again, mostly just for the 18% despeckle on DVD-ready MPEG-2 captures.