...rationale for their existence being...?

Oh, yes..."...reducing resonance and vibration..."

Well, I have Audio-Technica Isolation pods...under my turntable...and they make perfect sense working in conjunction with an analog, mechanical device that is subject to structure-borne vibration/feedback...

Unless you have tubed (valved) electronics which can fall prey to microphonics...Some CDPs may be overly sensitive to some jostling but in normal use this should present no problem, if heavy footfalls cause your player to skip, I'd say you have more serious construction issues to contend with...I haven't yet seen (or heard) any evidence of anything similar to microphonics happnin' in other solid state devices...Other audio-types go for sand bags and lead shot...

Any techie info from Nordost or just the requisite unsolicited, anecdotal accolades? Available in aluminum or titanium? Entry level and higher grade? Hm-m-m-m...

jimHJJ(...and it makes me wonder...)