Never trust a cloud mining site. most of them are just ponzi sites that will scam their customers some day. and in the real mining sites will not be able to get your ROI because the difficulty is very high
Actually I have been told that if i order a big amount hashrate contract, i will be connected to F2Pool.
so it means it's the same as real mining, right?
"You have been told" , that's what Cloud mining is about , you don't actually see the miners .
Some of the cloud mining companies don't even have actual miners running so It's really not recommended to invest on them honestly , better buy more Bitcoin and hold them for after the halving , It's a better investment method .