Ive seen the site and its just an another scam since its a Cloud mining site which do know that most of them are just ponzi schemes and the thing here is that those returns even unrealistic at all and its pure lie. If you do try to compute thats almost 5 months ROI. How can be so sure that they do put significant fixed amount of profits per month? If you do consider the mining difficulty do rise overtime for sure it wont really be consider to be fixed and also is the calculation is inclusion on the maintenance fee or whatsoever?