Some people might find this useful, or not, but one of the things I’ve been exploring lately in terms of whether or not I need to enhance the isolation of any of my components is to properly quantify the vibration each component is experiencing (especially important if one’s thinking of spending relatively big $$ on this 
).
Surprisingly, I found the accelerometer built-into the iPhones are super sensitive, and when coupled with the right App, does an amazing job in measuring actual vibration through the components.
I haven’t come to any conclusions yet, but for others that are interested, this (paid) App seems pretty good;
Here’s a measurement snap-shot with my iPhone sitting on-top of my Vivaldi Transport - the two spikes below 10Hz is caused by me taking an iPhone screenshot 
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With something like this and home-trials of isolation devices, it’ll be somewhat easier to qualify the efficacy of what you’re about to buy. 