I have good experience with this service. I have used it for a while. The upgrades make sense and are well priced as well as affordable for less wealthy people, too. However, I advise you to consider the opinions above me. Probably, I was just lucky in the past and I do not use the service anymore.
You must have been lucky if you received any payout from them. This normally happens to the first people to use any scam service. Once the scammers feel they have accumulated enough, they stop paying and disappear with peoples money. I tired their free service but so far I have pending withdrawals for more than two months.
You could able to withdraw the earnings if you deposit on their site. I could say that joining this kind of cloudmining sites are just pure hyip which they gone if they get enough money from their members. There are still some people who make profits especially to those who join on earlier times when it was just launching. Investing money on this sites is too risky because the chance of losing money is high.