Anyone familiar with Stack Audio Stabiliser and / or their turntable mat?

I should mention that the mat's sleeve it arrived in said a record spindle weight of up to 500 gm is ok (my F/R is over that).  Doesn't matter as I'm leaving the Stabiliser on there.....

Thanks, all. howardlee's comments were especially helpful since he also uses the Technics SL1210G (same as me)!

I'm using the Stack on a Linn with a Herbies. I think its working but always hard to tell compared to what else. So many variables but I'm happy with it. 

It is not Just the Mat Material>Material Thickness that brings the tidying up of the sound to a place where the Mats effect is quite noticeable for being a Betterment 

There are additional benefits to be had when a thin separator material is used between Platter and Mat.

I use a Technics DD TT and do not limit myself to One Mat Type, I have a AT 677 - AT 666 and a Gun Metal Platter Mat in use as Metal Mat Options.

The- AT 600 is used as a Hard Non-Metal Option

5mm Forex Foam is my preferred material as a Soft Option.

I also have a 1Kg Composite Puck Weight that has the best influence over all other owned Puck Weights.

Configurations produced using the above, have never produced an End Sound that I am not wanting to experience.  

I have heard the Zavfino Puck Weight in use with some of my Mats and also compared to my owned composite Puck Weight. The Zavfino made a very good impression, especially trouncing a selection of other Puck Weights used on the day, with a PTP Solid 9 TT as the device used for the demo's.  

On the same day a DIY Produced Leather Mat was also very impressive on the Solid 9.

Above Mats are affordable and if purchased with a prudent approach and will resell at as good as the purchase price, if one is not wanted to be maintained in use.

Buying New is an expensive way to learn and lose monies fast if the purchase is not wanted to be maintained.