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.