I think a lot will depend upon the tonal balance of your system. I prefer using the Classic platter naked (esp. for the dynamics, low end and resolution) but if one had a system that might be a little lean or tipped up, a mat might be the answer. BTW, VPI did provide two mats with the plater, one being a thin paper and the other being rubberized. One doesn't really need to worry about SRA/VTA with the paper mat but will need to adjust those parameters with the rubber. You might look up my comments on the platter at PFO/Products of the Year for last year.
VPI Classic Platter- Naked or better with a mat?
I was contemplating trying a Living Voice Mystic Mat or Millenium mat, as I've read very positive reviews about it for my Super Scoutmaster Ref. rimdrive. I called Music Direct and was told to leave the Classic platter as it is without using a mat, as it is a beautiful platter the way it is. The salesperson also said he did not hear it with a mat, but thought it was great without any mat. Very refreshing to not be told that it would make a positive difference and try to sell you. I appreciate that about Music Direct. Just wondering what others have tried and what your experiences are with different mats. Thanks.