Cement tonearm and cartridge info

Has anyone here had direct  experience with the Cement tonearm and mono  cartridge. I am doing some research for a friend. Any experiential info appreciated.

Here is an interesting link - https://anamightysound.com/clement-cartridges-one-way-to-go-mono/

http://soundgate.net/products/detail.php?product_id=305

Thanks