I've had over £200 in my account for months and it says something like "waiting for funds from advertiser" maybe 4 months and i havent been payed, ive submitted 5 support requests over a month and they dont reply. They support team is useless. But they still have time to spam my inbox with shitty newsletters of naff affiliates.
I've never really had much of a problem with them. Maybe you should only do a small amount of leads/sales with each advertiser so that you know how good each advertiser is at paying first of all.