Thanks for the post but should warn anyone reading that two of the above mining sites are deemed and scammers... megnet ask for you bitcoin wallet key and not address and googling the site it is highlited as a total scam. Micro btc is also tagged as a scam with many reviewers losing lots of money a d blocked from accessing their account.
I can say though i have used eobot for the past couple of years until i realised that without a continuous purchase of hash rate i would never make the payout requirement before being able to withdraw. And that withdrawal would not be near the input value.
Todate i still stand by two companies. Hashnest ran by Bitmain themselves and hashflare.