Adona audio Racks. Anybody use them?

I own a Zero SR4 rack:  https://www.adonacorporation.com/zerosr4.html .  I like the fact that one can position its shelves literally anywhere within its confines.  It does a great job of supporting and isolating my 120 lb. turntable.  And as mentioned above, Adona's shelf isolation design seems to be theoretically sound.   

I agree with your assessment that they are high quality at a reasonable price point.