Just ran 24 hours on Antpool PPLNS with one z9 mini oc to 750MHz. I have mined 0.14004336 ZEC which is about $22.64 USD
16.42 avg Ksol. 9401 accepted and 50699 discarded.
I just received my 2nd z9 mini today and it is running on Flypool oc to 750Mhz. I plan to compare them tomorrow.
I am interested in your results. I've been on flypool 22 hours now and have mined 1.36 ZEC. OCed to 650. Haven't had any invalid shares yet.