I have switched from Nicehash to prohashing, and am earning between $5 and $7 per day per Z9 mini in BTC.  My wife and I were mining Zen for the last month, but decided to switch for simplicity.  So it is ROUGHLY a 120 day ROI at current returns, which is not quite as good as the Z1 if it works properly, but better than most.
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Thanks for the feedback, so with x6 you are getting around $120 per day mining Zen? Okay and these machines can still fetch around $500-600 if you decide to sell