Back-test performance on 1 hour EURUSD from 1-1-2011 to 1-1-2012 isn't very good:
I also tried 15 min and daily with no luck. However, H4 shows some promise:
$1389 profit, winning 54.8% of it's trades. Quite a difference from the other time-frames.
Back-testing on H4 GBPUSD wasn't so great, although interesting to see it broke even:
But quite the surprise from H4 AUDUSD:
$3986 profit, an almost 40% return over the course of a year. Only wins 59% of it's trades, although the equity curve is decent. Also, the draw-down is much less than with the other currency pairs.
I don't recall ever seeing a robot which performed better on the AUDUSD than the EURUSD. If I had time, I'd investigate further why this is.
Now, if only these robots would perform as well live, or even demo forward tests, we could all be rich. Sadly, this is rarely ever the case.