Most of them don't book your trades and trade against you. The only way you have a real setup is through a Prime Broker / Clearer but you need 10m$ to place with the prime broker and 10kú minimum monthly fee, then you can connect directly to venues like Currenex.
All the other guys, TD, Dukas, FXCM, etc. etc. etc. either don't book you or sell your flow to hedge funds.
Just do the math. It costs them 1,000$ in marketing to get 1 client. On average their clients have 4,000$ accounts. If all the money they make is 10$ per million you trade, there's no awy they'll make 1,000$ on a 4k$ account. Whereas not booking you will make them 4k$ when you blow up.
I don't know anyone who has made money in FX.
If I were you I'd trade futures or give my money to hedge funds / money managers.
I did contact them about opening an account, the only drawback that I had was that as far as using them for FOREX, they do not support NinjaTrader. Which after paying so much to for the NT licensing, if the broker doesn't support it, I can't use them as a broker.