First of all this app cant compare with Google’s voice search app. It does sooo much more and it seems to be much more receptive for non N. American accent. The design of the app is user friendly. From the home tab, the button you tap to trigger the voice-recognition is fat (check it out in the screen grab above). So your thumb, however svelte or thick, can’t miss it even if you aren’t looking. The virtual button responds to being held down and released or tapped to start and tapped to finish when commands are spoken.