If you do some digging you can see a  good percent of cloud mining services were scams form the beginning or were so insanely overpriced.

CEX.io for example was always 10x any reasonable price for ghs yet people not understanding kept buying.

Others went to cloud mining services that never proved their hashing but offered amazing deals that later turned out to be ponzi schemes.

There are very few surviving bitcoin cloud services but remember Hashnest is owned now by bitmaintech.

It is one of the only reasons I use hashnest as you can verify they are mining and also they make the equipment.

Bitmaintech was an probably the best company out there for giving customers a chance to roi on equipment months ago.  They have got a little more greedy but are again showing signs that they truly are trying to offer their customers the best deals and chance to ROI in my opinion ( hope it continues getting back to how it was ).   

In short in my opinion Hashnest is one of the best value true non scams ( as much as you can be certain in todays wild west of bitcoin ) out today. 

You never know what will happen or what company will fall apart next but Bitmaintech/hashnest is the one i feel most confident about.  Next would be probably Cryptsy/mintsy ( new and have not used them yet but they have cryptsy's name behind them it looks )  also cryptsy/Mintsy charge more then Hashnest it looks at the moment.  Lastly would be Spoondilies/genesis mnining... Spoondoolies and genesis mining from what I know have not had much bad press ( but again I have not bought their new offers and are more expensive then bitmain/hashnest )  I have an old contract I tested on genesis mining I bought .10 th that is still paying to date ( but will never see roi because was bought at the wrong time.

Lastly, in my opinion I believe with the competition out today, slowing network difficulty, and more stock offerings vs 6 month preorders that never arrive and the slowing tech leaps in asic designs it is becoming one of the best times to start mining.  The only thing I would be careful of is there is one more tech leap inc before I think that variable slows down.   The bitfury chips etc....  Although I highly suspect hashnest is starting to take advantage of that in their newer offerings.