Back in 2010: Gain Capital has been http://forexmagnates.com/nfa-audits-...-fails-itself/ for abusing its Virtual Dealer plug in and configuring it to unfair trading configurations. The plugin has been configured to accept customer orders when slippage moves unfavorably from them and reject customer orders when slippage goes against Gain Capital.

Http://forexmagnates.com/nfa-to-inve...ing-practices/

I personally have not heard anything good or bad about them since (that I can recall ).