The mining difficulty made a huge leap on the last day, so I would avoid any cloud mining service.
Yes, and I've sold all my S7 hashpower today at Hashnest. That's the point of Hashnest and that's how you can make profit: buy hashpower -> let it work and earn 0.3-0.5% daily for you -> sell hashpower.
Hashnest is the only (or almost only) cloudmining company you can make profit with (by selling your hashpower). But it's not so easy, and you won't get rich using it so I don't say it's a safe bet investing here. I'm more a "buy and hold your bitcoins" guy.