Tim,
I have had a similar set out of acrylic for years. I didn’t like them as much as these. The acrylic bases on the others made an audible scratching noise. Unlike the more substantial material on the Nobsound.
I can’t really make a substantive comparison at this time but my system has never sounded better in the last few weeks and this change today did nothing to harm this. I do believe the power of the low to deep bass has benefited.