The Forex Samurai Service was released in June 2010. It is created by the developers of Forex Kagi. The vendor provides a set of bonus indicators and has a very useful documentation. This signal service works on two pairs: EURUSD and GBPUSD. All the optimization is done on the samurai server.
You have to attach Samurai EA to one chart only - it will work with the proper currency pairs in any case.
The Forex Samurai will use necessary parameters from the server and choose a pair according to the signal.
The only disadvantage of such approach - there is no way to do the backtest in MT4 because the trading logic is located on the server part.
All you can check is a live statement from more than 17 months of trading on the robot's website. The results are pretty impressive - 10k account turned into 170k
You can check my forwardtest of Forex Samurai and till this moment it have great results of trading.