Vintage DD turntables. Are we living dangerously?

Wasn't it enough just to adjust the one higher or lower? 

By adjusting one direction then the other lewm was 
able to locate the "sweet spot" not to high or to low.

SAEC's SS-300 mat is aluminum, anodised black and then coated with a very thin ( and very strong ) teflon coating

The success of the mat is in its cut-outs in the physical design as well as the coating which stops ringing and is gentle on records as well as being anti-static and balanced

Long out-of-production, I've tried dozens of mats and the SAEC is a keeper

RTatts

SAEC's SS-300 mat is aluminum, anodised black and then coated with a very thin ( and very strong ) teflon coating

The success of the mat is in its cut-outs in the physical design as well as the coating which stops ringing and is gentle on records as well as being anti-static and balanced

Long out-of-production, I've tried dozens of mats and the SAEC is a keeper

I have the same feelings, it's one of the best mat in my opinion. 
Here is the one on my Luxman PD-444, it's perfect for almost any turntable, i've been using it on Technics SP-10mkII and SP-20 too, it is also fine for SL1210mkII+ series, Victor TT-101 or Denon DP-80. 

When i bought NOS sample in the box (with manual) i notices red tool and a small metal piece that allow to tighten up the mat to the spindle with a tiny screw (this is why there is a very small treated hole in the mat near the spindle hole). When you're buying a used sample these parts always missed and i believe a few people seen it.    

Would one say it is truly worth $300 though?
That's about average price being asked by Japan resellers right now?

@uberwaltz It’s a minimum price on ebay for used without box, buy it if it’s clean, the price increased in the last 3 years, this is what i noticed myself. And NOS units normally twice as much.