Since I started mining I've always bought my hardware from Bitmain. When they opened their mining services I was one of the first to start using it. You can easily get some profit out of the platform because you can trade you ghs at the same time they are mining.
So you are talking about profits! How much can you exactly get monthly if you invest let's say 2 BTCs into some contracts? I know that Hashnest is the legit service and all, and I have tried it a while ago, but when I saw how much time I will need to ROI, I have just gave up on it!
Cheers!
I don't remember exactly how much time can get to ROI there, but problem is when you buy power and price is going down. You can earn there when you buy GHS in first days of releasing new miner. Then mining 2-3-4 months and selling with little loss on price. But if wait to long with selling, information about releasing new miner is killing price and you are losing. Thats all trick.