Any cloud mining service there is not a chance you will get your ROI
If you like just give me your BTC and I will release a small portion to you each day, but in about 45 days from now you will lose the rest.
We can do a test if you like
Just check this thread about HashOcean:
https://bt.irlbtc.com/view/1259703.0With simply math you can check that everyone who buy contracts 4 month ago or earlier already reach ROI.
However, that doesn't mean, that HashOcean is not a Ponzi Scheme!Actually,I know a person who first invested the Hashocean in April 2015.
I know many people who invested there a lot, and already are getting from there nice profit everyday. For example me

However I invested there with the full knowledge of the risks.
My first referral shortly will be have 300%:
03/16/2015 07:19 max3*** 185 KH/s
I'm not saying that HashOcean is not Ponzi!