I tested these kind of cups years ago.
It wont work at all, beside the lateral tollerance they get while using its exact as ScooterPeru says, the plastic wears out real quick an then your not happy it all.
This Urtehane I do not know but if it is like Matter (read: Chinese) then its real bad quality, this Urethane breaks to easy what is not quite normal for Urethane.