Symposium Roller Blocks vs Aurious under SACD ...

No, but I was so impressed with the improvement in performance of a Neuance shelf under my old Rotel CDP that I'm even getting a larger one for my new EMC-1 MkII.
Great coherence without muddiness or treble edginess.
Clearly better than cones or air bladders, etc., and indeed I prefer to NOT have my 44 lb CDP rolling around! Maybe true for your SACD transport? Good luck.

Oh yeah, Subaruguru. I have travelled some new circles recently and used different rollerball products. But I am back to E-A-R feet and Neuance shelves, and the music just speaks for itself. I did not like the Aurios at all. If using a very heavy shelf the Aurios added the best clarity, but if using a light/rigid shelf like the Neuance (the only way brothers and sisters) they sounded worse than the Symposium or Final Labs. But I have concluded rollerball products are just a better mouse-trap than cones, but you are best to not use cones/rollerballs if at all possible - which is indeed possible.

Subaruguru, where can I read some info on the neuance shelves? I'll hunt around in the archives....thanks in advance....

Bluenose: yes, check the archives, esp re shelves and CDP supports, if I recall. You'll find Ken Lyons (producer of Neuance at Greater Ranges) to be enormoously helpful and
very technically astute. Lots of good ole R&D behind this product. His A'gon handle is caterham700 or the like.
My Beta heavy duty shelf should arrive by the weekend. I expect similar success to my earlier application.
Good luck.