I think theres none. Sure they are leigitimate but the question is, is it profitable? Definitely not. It's not worth to invest IMHO. It's not worth because it takes years before you get your roll of investments plus the risk of being a victim of scamming. A lot of cloudmining all over the net are being reported recently because of stealing or ran away together with the investors money. We don't how long they will exist. Genisis and hashflare are good and operating for a long time. No question about their reputation. The problem is the profitabilty.
Really? Did you tried it? Please provide your proof here.