well, if you drive leisurely and not pushing to the limit, your next replacement for the zeta should be same with the rest.
i've had used new zeta and kenda(single round), nangkang, hero and gt radial for drift and they last the distance.
other brand like indonesian made forceum and pace is quite disappointing though.
again, its all down to driving style.

from my experience, those relatively unknown china made tires a quite risky when driving constantly at higher speed. even more when pushed during the corners.
the reason why i only used it for a single round of drift was that is start to flex like no tomorrow at the end of the round. thorough check shows there are visible fine lines on both sidewall ; a sign of it could explode anytime upon further abuse.

also, the roaring issue as mentioned by some are simply caused by 2 main factor ;
either you bought a deep directional tires with harder compound or your bushes are all worn out. it has nothing to do with branding.