Very simple and useful!
One problem, however. For some reason the program assumes half the menu items are Japanese and nothing I can do can alter that (though I can figure out what is what, it is pretty annoying). It also manages to convince some other apps' menus to be in Kanji... (but this goes away when J> quits). Pretty odd behavior.
As far as specific ratings for Features/Graphics & Sound, as there's only one real feature and no real rateable G&S, I didn't give it 5 simply because there's no real things to rate.
It seems pretty stable except for the language issue.
And you can't beat the price. Though probably worth a couple of bucks, put this together with an interface/PPane that will allow you to assign Keypresses, menu selections, and mouse movements to the gamepads/devices, and this could easily be worth $20-25. (mainly because I have tested many such interfaces and most are far from stable, or are horribly unusable (keypress assignments only).