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.