If iBelink really is building and shipping 3000 units you can throw out all all the calculations for ROI.  Diff is going to the moon, profitability is going to crash.  The only thing you can do is guesstimate what might happen.  

If we were to get some of the first units and started mining like crazy we might see an ROI in 6-8mths IF we are lucky.  I suspect it will quickly go out beyond a year and will be like trying to mine BTC.  Only shot is to get one of these early.  If you pick up one later the chances of ROI look pretty grim.  

Of course that all assumes that these units hash at the advertised rate, which so far the limited look at the one that was online was quite a ways off from the advertised rate.  I am not so sure this thing is ready for prime time.  I would like to see some more data from the miner.