My experience is that the poorer the suspension of the table, the more beneficial the Ringmat will be. Tables that can't properly drain air-borne vibrations or lack isolation from floor-borne energy may respond positively to tweaks like the Ringmat.
The arm / cartridge tracking across a record with / without the Ringmat is kind of like someone walking across a floor that is rock solid in terms of consistent support or a floor that is "springy" due to having limited support with the supports spaced a distance apart. Obviously, one of these will be far more consistent in terms of what to expect in terms of "sure-footedness" ( tracking and vibration ) whereas the other is going to introduce variables into the equation. It is for this reason that tables that are more advanced / suffer less from microphony and smearing due to vibration induced resonances won't take too well to this type of device.
With that in mind, i would recommend avoiding the $60 - $130 expense on one of these items and investing that towards a better turntable and / or turntable installation. After all, you are talking about a piece of cardboard with a few rings of cork glued to it. I'm NOT saying that "tweaks" don't or can't work. What i am getting at is whether or not this "tweak" is really worth the money. Could you find a more effective way to combat the problems that this tries to address? Personally, I think so. Sean
>
PS... No weight to transport, no fancy packaging required, minimal outlay in terms of production materials, etc... Must be a helluva profit margin in something like this. No wonder the places selling it recommend it so highly.