Anybody tried these brakes

Happy New Year to everyone from South Africa

I have a 1972 Aussie Valiant Charger but I'm using a Mustang II spindle with coil overs

Saw these Helix Wavestop rotors: Mustang II Disc Brake Conversion 2-piece Spindle 11in Big Brake Conversion 5x4.5 | johnnylawmotors.com

I was wondering if anyone had used them or had any insight into them, weight etc
I think they use large GM single pot callipers - any ideas on how they work?

Thanks,

Brett