Am I disqualified from answering? I have a $2K+ turntable and tube equipment. From my experience, the differences have become more subtle over time, as the turntable manufacturers have gotten better at providing stock mats that perform near-optimally with their 'tables. Years ago, there were many, many mats available because the stock mats often left much to be desired. To my mind, the whole turntable mat situation is now different than a lot of component upgrades, tweaks and accessories. Cables aren't optimized for the components they connect. Tonearms and cartridges aren't necessarily optimized for each other. Speakers aren't optimized for anything "upstream" or your room. But there isn't any reason for a modern turntable manufacturer to provide anything incompatible. And once "compatible" is achieved, we're really working around the edges of performance. If you do decide to change, don't worsen the compatibility! In particular, consider where your turntable manufacturer has chosen to "isolate" vibration - in the feet, in the plinth, in the suspension...perhaps in the mat/record interface. (I'd say this was part of the original Rega Planar design, with the felt mats and "hard" feet and absolutely rock-solid plinth...if I recall correctly.) Then again, when it comes to audio (or damn near anything), I'm not looking for any excuses to spend. I have enough "needs" without creating any "wants".