I didn’t have much luck with the Koma attenuators. The quality of the pots isn’t very good IMHO and they feel overall like they’re going to break, although mine haven’t for the small amount I’ve used them.
RYO airtenuators are hard to find, especially prebuilt. I was able to score two of them, wanted a few more and never could before giving up.
The Boredbrain Splix are interesting, though as an audio crossfader the “mix” isn’t super clean and the two waves interact oddly.
At some point though I decided I just wanted all my attenuation in the rack anyway. 2HP Trim is pretty handy, as is Shades. Usually I iforget the attenuverter channels on Maths unless it’s part of a bigger Maths patch, for whatever reason.