FWIW my experience is that the vibration control effect is more important than the dielectric. I recently upgraded from Shunyata Dark Field Elevators V1 to V2. The latter have an elastic suspension. On my long (10 meter) interconnects the impact of the suspended lifters is noticeable. Greater clarity and ease, without them the system sounds slow and congested
http://www.shunyata.com/index.php/products-vm/accessories/df-ss-detail
personally I have never liked the heavy porcelain ones my alternative (which I use on the long runs providing power to my actively shielded cables) are the simple Doug Fir ones from Cardas. The Shunyata are expensive but you could come with a DIY alternative with a similar elastic suspension
http://www.shunyata.com/index.php/products-vm/accessories/df-ss-detail
personally I have never liked the heavy porcelain ones my alternative (which I use on the long runs providing power to my actively shielded cables) are the simple Doug Fir ones from Cardas. The Shunyata are expensive but you could come with a DIY alternative with a similar elastic suspension