I'm having trouble with it, in that it's "just" not working. For some reason when pressing the mic button, all I see is a mic with a red diagonal line through it. Google Voice Search is installed, and working perfectly in the google search widget. I had Google Voice (not the same as Voice Search) installed, I think it's the internet phone thing, but I never got it to work. It's a piece of crap anyway, so I hope that isn't the part I'll need for this.
Unfortunately, this forum doesn't allow to search for "voice input" so I can't know if anyone else had this problem adn has solved it (maybe fix that too?)
The wiki also doesn't reveal much about it - it just explains what the options do, but it nowhere explains that a 3rd party app is needed (it is, right?)
So, anything that could be missing?
I'm using the latest Market version on Android 2.3.5 on a Nexus One.