The biggest problem is that because their services are pegged to fiat amounts instead of h20 token numbers people are not able to redeem their tokens for the gains that were proposed at the ico. If someone got $500 worth of tokens they would be lucky to receive $500 worth of eth in 2 years time. They should really have pegged the mining contracts to h20 amounts to ensure that token holders got what they were promised. Very poor IMO.