My calculation for the next 2 years: Maybe round about 7.2 BTC per Prospero X-3 (batch 1 as 2 TH/s Miner), when it is start mining TODAY or within THIS week. EDIT: And 10.8 BTC, if you get a working 3rd unit (so it is 3 TH/s at the end)

For example: If you want to use the 3 TH/s miner anywhere in Europe, the power costs is double the price of the mining costs.
In other words: It will never ROI. They should send 2 full X-3s for compensation of the total lost. At this moment, it is better to never start the miner hardware due to the power costs.