99% of mining cloud is scam, and there is huge chance that you are going to lose all your money... Again ask your selves, if they can use that mining hardware for themselves, why would they sell you their power? Best thing what you can do is buy miner, and find someone who will host it for 70-100$ per month. You can find very good hosts on forum if you dig a little bit. Other then that i would just buy hardware and make silent box and shove it up somewhere in your house where you will never see it again and watch your Bitcoins stack in your wallet