Only just found out about this. Works great with my PS3 controller, that I had lying around anyway.
Only grudge I have is that sometimes it is a bit dodgy with screen orientatiom in landscape mode. But usually it is not much of a deal.
Can only recommend trying this, although the price is rathernhigh with 7$. But luckily there is more than one Cydia source for this 
“The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.”
- Albert Camus
