By using an ECN Forex Broker you will experience some unique advantages.
A Forex ECN such as MB Trading will electronically try to match up your orders with other forex traders that are attempting to take the opposite position of you.
If there are no order takers your orders will be passed on to a multitude of liquidity providers competing for your business.
This provides you with some distinct advantages such as true market pricing with minimal re-quotes and slippage, full anonymity of your forex trades, ability to scalp, and the ability to place orders in between the spread.