Ok, tested their service for almost a month now.
There are certain good things about it, certain bad things about it.
Good:
Fast response time from their costumer service.
Delivery of the services is decently fast, from a few minutes to a few hours, or a day, on average.
Bad:
Certain services are misleading, for example I bought real instagram followers, at a fairly high price compared to other services on here, but the accounts provided by instant-fans accounts were bots.
Will I continue using their service? Most likely not. Not the worst, not the best. Prices are fairly high.