Living Voice Mystic Mat Platter Upgrade

I'd like to know if anyone has heard or purchased the Living Voice Mystic Mat? Is this Platter upgrade really worth the $329?

Is that $329 USD? It's listed for $450 with the Mitchell clamp at Acoustic Sounds.
Here's an Audiogon thread about this very mat from 2006.

has anyone with a Rega TT tried it, and does it require a VTA adjustment?
I had a Rega and loved my Boston mat with it. Makes a real difference. The felt mat
I do have the Mystic Mat with a Scheu Premier, and it was one of the best upgrades I ever did - better soundstage, better defined bass and voices. Recommended.
Florian Hassel