Look at the scales! 😎 and yes the sound difference is noticeable to the ears to a significant scale, but also even in sound measurements. I will see if I have some measurements pictures.
For Herbies and Isoacoustic, the range is 0.001-0.002 with lots of peaks over 0.002. Or 1/1,000 and 2/1,000.
For Nosebound/Disk of Silence the range is 0.0005-0.001 with very few peaks over 0.001, or 5/10,000 and 1/1,000
The smaller the vibration the better; although I am not a mechanical engineer, I have been told that vibration optimization is not linear but something between linear and exponential with a lot of qualifiers.
I have a Trimov ST2 Pro that now and then I use in one of my systems, and the corrections from nothing to Nosebund/Disk of Silence are significantly reduced, with the Credo/Townshed almost insignificant.
The cool thing is that I can on-off the corrections and immediately notice the sound difference. I did not bother to do the Isoacoustics and Herbies as with the mechanical and listening tests I discarded them.
Good luck! experimenting is fun.