Yes, they are part of the Microgaming network along with
Pokertime and about 30 others. I used to play on 7Sultans (also Microgaming) a lot and never had any problem withdrawaling with them, so I'm thinking you're probably safe. I haven't played there for a couple of years though, so I'm not sure if anything has changed since then. You may want to check with them though if you have accounts on multiple Microgaming sites, kind of like CakePoker and others on that skin, there may be an issue with multiple skin accounts. But as long as all of your info is correct and accurate, I can't see there being much of a problem.