Has anybody heard a Monster cable Alpha Cartridge?

Greetings I am wondering if anyone has ever owned one of these? and what their current value would be

Ive read good reviews and Im wondering if I should bid on one, any input is apprecciated
They are fabulous cartridges even in today's context. I have an alpha genesis 1000 and 2000 in boxes not used for sometime but perfect. They still fetch good $ today. They are made by the same company that make ZYX cartridges.
Had several of them years ago remember them as very nice sounding. They however should be quite old by now 15-20 years so depending on how stored the suspensions could have deteriorated. From memory they were made by ZYX, but not sure about that.

Good Listening