I've been with Mgcash since the beginning of 2012 and I must tell you it was the first network that made me some decent money.
I see everywhere complaints about EPC, but people don't realize that the CPA game is all about the quality of the traffic. Using gateway lockers with international traffic can only go so far on EPC. I mean, with standard CPA, you will have geo - targeted within the offer itself, so your EPC will be generated from, let's say, US only traffic, thus will be higher since US offers pay more regardless if locked or not.
If you care abut EPC, which I don't, either set up a geo script or send better, US traffic, to your lockers. If you care only about the money, send MORE traffic, period. I even had some $7-$9 PIN submits from who knows what country.
Furthermore, with Mgcash I had my first $100 day and WIM is the best anything-owner I had ever met. If you have any serious issue, he will help you no matter what. I don't have the same love for the AM's but WIM always came through when I asked for his help (even the day I literally flooded their servers with traffic).