My Z11 is mining at MinningPoolHub, Zcash and getting an accepted ratio of 99.72%. I tried NiceHash and it was around 90%. My average rate is 140.43 kH/s. I have not tried other coins yet but all seems to be running well.
Had 10 Z11's on Antpools ZCash and very disappointed in first full hash rate. Specifically, what Awesome Miner and the Z11's control panel show with regards to hash rate is far higher than Antpool advises. So doing a test:
5 on Antpool and
5 on ZHash
Only 5 hours in but hash rate is far better on ZHash. Will update test over next few days.