This site seems to be the same as bitminer.io which ia not paying if you'll just use the free and not sure of being payed if you upgrade the version (see bitminer thread
here ). The safest choice in my opinion is to just avoid investing in this kind of service. Try the free one if you like since you'll not be doing anything but to wait for the minimum withdraw amount. If you're looking for mining, Hashnest is the only one I could suggest. Take a look in their ANN Thread
here and decide for yourself.
They do of course have the brand name of Bitmain backing their credtability and risking it if they indeed do fold one day.
Cause as we all know these type of companies can not last forever and most if not all of them fold and runaway eventually with only one or two of them left after an average of 2-3 years of operation.
Bitmain isn't an example of a company that could just fold. They've been around for a long time and have a lot of other services, and the amount of money that they earn is so high that they don't even have an incentive to scam people. Not only that, but they have public figures like Jihan Wu, so if they scammed anyone he couldn't bet on staying alive for long.
I have been looking further into these companies and have been trying to see which one would payout the fastest so to get what you actually end up putting into the site and walk away with at least a decent amount of profit and not just 10mbtc to risk your bitcoin while doing it for 3+ years.
That in itself is just a silly thing to do.
So how long have they been in operation? And are they more reliable than Hashflare which is run by Hashcoins?
That's a really bad way to look at cloud mining. If you're looking for which service will pay out the fastest, you'll just find thousands upon thousands of scams which appear - and disappear - every day. The only ones which I doubt are scams are HashNest, ViaBTC and probably Genesis Mining and Hashflare. If you're concerned about leaving your Bitcoin at risk for years, well that's what cloud mining is - you
can't expect guaranteed profits, ever, and mining is inherently unreliable. Still, ROI in a couple of years, which you could (probably, if the difficulty doesn't change) get is possible on HashNest and that's unusual for most normal investments.
I wouldn't invest in HashNest if you have morals though, Bitmain are slowly centralising Bitcoin with their huge Antpool and all their miners through HashNest.