Yes. I can't test it either because my results are already too good.
but if you are trying to train it with a strong accent, or like Wanilton does (I think) train the English engine to understand Portuguese commands, then the training is important, and I am hoping this can be a useful tool.
Also, for anyone who has a particular command that is commonly misunderstood, maybe this could help.
Actually, I have problems sometimes with the computer not differentiating very well between "On" and "Off". So maybe I can test with that.